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Mass & Slim Shorts
Smooth, lifted and comfortable under your dresses, jeans and scrubs.
High-waisted, seamless shaping shorts with Tourmaline beads embedded into the fabric. They smooth your waistline, lift the buttocks and shape your hips and thighs the moment you put them on, while the beads give a gentle micro-massage that supports circulation and lymphatic flow. Made for nurses, moms and every woman 40+ on her feet all day, without the discomfort of traditional shapewear.
One-time purchase. No subscription.
Clinically Tested. Independently Verified.
In a 30-day third-party clinical study, women who wore Mass & Slim Shorts 8 hours a day saw:
*Third-party clinical study: 30 women wore the shorts 8 hours a day for 30 days with a balanced diet. No control group. Individual results may vary.
▶ Watch them in action
What women are saying
On a 10 hour shift"I'm a nurse, these are amazing under my scrubs. It's like a booty massage for my 10 hour shifts."
Cyndee L., verified buyer
No rolling"Most everything I've tried out on the market has always rolled. These stay put!"
Caroline S., verified buyer
Holds in, not tight"They hold everything in without feeling tight."
Nancy B., verified buyer
Under a dress"I wore them under a dress for a party. They gave great support while being super comfortable."
Pietra A., verified buyer
All-day wear"Shorts are comfortable for all day wear under any garment of clothing. Loving these!"
Kate S., verified buyer
Read all verified customer reviews
Wearing them every day? See how the 3-Pack saves you $64
The things you worry about, answered
What they do for you
- Smooths your waistline, lifts the buttocks and shapes your hips and thighs the moment you put them on
- Helps smooth the appearance of cellulite with consistent wear*
- Supports healthy circulation and lymphatic flow
- Breathable, cooling comfort for 8 to 12 hour wear
- Invisible under clothing, with no rolling, pinching, or visible lines
Will they roll down?
No. The high-waisted, seamless design stays put and doesn't roll down or pinch, even after hours on your feet.
Will they show under my clothes?
No. They sit smooth and flat under dresses, skirts, jeans, scrubs and work pants, so no one will know they're there. Under very thin or skin-tight fabric, pair them with a slightly heavier layer for the smoothest look.
Will they be comfortable on a long shift?
Unlike traditional shapewear that squeezes, Mass & Slim Shorts move with your body. The breathable, cooling fabric sits smoothly against the skin, made for 8 to 12 hour wear.
Will my tired, heavy legs feel lighter?
For women on their feet all day, the gentle support and Tourmaline micro-massage help legs feel lighter and more comfortable throughout the day.
Find your size
Order your true U.S. size, not smaller. Size up only if you're between two sizes. For example, between Medium and Large, choose Large.
| Size | Hip | Waist | Height and weight (approx.) |
|---|---|---|---|
| SmallUS 6 / 8 | 36 to 38" | 26 to 28" | 4'11" to 5'6" 115 to 135 lbs |
| MediumUS 10 / 12 | 39 to 41" | 29 to 31" | 5'2" to 5'8" 135 to 160 lbs |
| LargeUS 14 / 16 | 42 to 44" | 32 to 34" | 5'4" to 6'0" 160 to 185 lbs |
| Extra LargeUS 18 / 20 | 45 to 47" | 35 to 37" | 5'5" to 6'2" 185 to 215 lbs |
One size chart for the entire Mass & Slim collection, true to women's U.S. sizing. As you wear them, the fabric gradually stretches and molds to the natural shape of your body, becoming more comfortable over time, like a second skin.
Buying the Black Compression Leggings (outerwear)? They have firmer compression, so size up one full size from your usual U.S. size. They feel snug at first, then stretch and mold to your body shape after a few wears.
Wrong size? Exchanges are free. Email info@theblackpurple.com with your order number and the size you'd like. We send a prepaid label and ship your new size at no cost.
Try Mass & Slim for 60 days
Slip them on. Wear them under your scrubs, your favorite jeans, your work dress. Feel the difference in the first few hours, and see the difference over 30 days.
Wear them for 30 days (the length of our clinical study*). Not happy? You still have 60 days from delivery for a full refund, even if you've worn them.
✓ 60-Day Money-Back Guarantee · ✓ Free Size Exchanges · ✓ Trusted by Nurses and Moms Across the U.S.
Plan your rotation
One pair to try. Three pairs so you never skip a day.
The clinical study had women wear the shorts 8 hours a day for 30 days.* Consistency is the key, and the women who see the best results wear them daily. They are machine washable and dryer safe, so a simple rotation keeps one pair always ready. One pair is a fine place to start. If you want to wear them every day, here is the math.
Thinking of two pairs? Two singles cost $175.90. The 3-Pack is $199.85, which is $23.95 more for a third pair.
Sizing first: order your true U.S. size, not smaller (between sizes? size up). Check the size chart. If any pair is not the right size, exchanges are free: we send a prepaid label and ship the new size at no cost.
1 pair
$87.95
$87.95 per pair
The shorts on this page. Try one pair first, see how the fit feels, and add more later if you love them.
Choose my size, 1 pairShorts 3-Pack
$199.85
$66.62 per pair
- Three pairs: one to wear, one in the wash, one ready
- Saves $64 vs three singles ($263.85)
- Any pair not the right size? Exchanges are free.
Want a full set instead of three pairs of shorts? The Complete Shapewear Bundle (shorts, leggings and waist shaper) is $199.85 and saves $64 vs buying the three separately.
Savings are measured against buying the same items one at a time at today's prices. Not sure of your size? Check the size chart first. It is one chart for every Mass & Slim product, and exchanges are free.
How the Tourmaline micro-massage works
Hundreds of small Tourmaline beads are embedded directly into the fabric. As you move throughout your day, the beads create a gentle, continuous micro-massage against the skin. That subtle stimulation helps support:
- Healthy circulation, keeping blood flowing through tired legs
- Lymphatic flow, for lighter-feeling legs
- Smoother-looking skin, softening the visible appearance of cellulite over time
- Lighter-feeling legs, especially valuable for women who stand all day
How to wear them
- Wear the shorts for 8 hours a day.
- As you move, the Tourmaline beads create a gentle micro-massage.
- Over 30 days, that consistent stimulation supports circulation and smoother-looking skin.
Your 30 day Mass & Slim plan
Week 1 to 2: Immediate shaping and smoothing. Many women say their legs already feel lighter, especially those on their feet all day.
Week 2 to 3: Skin may start to feel smoother. Some women notice their legs feel lighter after long days on their feet.
Week 3 to 4: Many report a visible improvement in the appearance of cellulite, with subtle changes around the waist, hips, and thighs.*
Consistency is the key. The women who see the best results wear them daily.
Frequently asked questions
No. It is a one-time purchase. There is nothing to cancel. One pair works well to start. If you plan to wear them daily, the Shorts 3-Pack gives you one pair to wear, one in the wash, and one ready for tomorrow, at $66.62 per pair. It saves you $64 versus buying three separately. We offer free size exchanges: email info@theblackpurple.com with your order number and the size you'd like, and we'll send a prepaid label and ship your new size at no cost. And if you're not happy for any reason, our 60-Day Money-Back Guarantee covers you, even if you've worn them. U.S. standard delivery is free and takes 3 to 4 business days. Yes. The breathable, cooling fabric is designed for extended wear. Many customers, including nurses on 12 hour shifts, wear them 8 to 12 hours a day. The fabric is breathable and cooling, designed for all-day wear under scrubs, work clothes and dresses. Tourmaline beads are embedded in the fabric. As you move, they create a gentle micro-massage that supports circulation, lymphatic flow, and the appearance of smoother skin over time. The shaping is immediate. In the clinical study, women wore them 8 hours a day for 30 days: 73% saw a visible improvement in the appearance of cellulite.* Individual results may vary. Yes. These are some of our most loyal customers: nurses on long shifts, busy moms, teachers, retail workers and anyone on their feet all day, who want comfortable shaping and lighter-feeling legs.Is this a subscription?
One pair or the 3-Pack?
What if they don't fit?
How fast does it ship?
Can I wear them all day?
Will they make me feel hot?
How do the Tourmaline beads work?
How soon will I see results?
Grey shapewear or black compression leggings?
Are these good for nurses, moms, and women 40+?
The Mass & Slim family. Choose what works for your life.
Every Mass & Slim product is powered by the same embedded Tourmaline bead technology, supporting circulation, lymphatic flow, and the appearance of smoother skin. The difference is how you wear them.
Grey Shapewear. Worn UNDER your clothes.
- Shapewear Shorts (you're here). Waist, hips and upper thighs. Best under dresses and skirts.
- Shorts 3-Pack. Wear them daily and save $64.
- Shapewear Leggings. Waist to ankle. Best under pants and jeans.
- Waist Shaper. Targeted waist and midsection support.
- Complete Shapewear Bundle. Shorts, leggings and waist shaper in one set.
Black Compression Leggings. Worn ON THEIR OWN.
Fully opaque, squat-proof outerwear leggings with firmer compression, for the gym, errands or out for the day. Shop Compression Leggings.
Shorts or leggings? Why not both? Many women own both and rotate them. Shorts under dresses and skirts, leggings under pants and scrubs.
Material and care
Composition: 53% Polyamide, 33% Polyester, 14% Elastane.
Care: Machine washable and dryer safe. For longest wear, use a gentle cycle in cold water and dry on low heat.
Ready to feel the difference?
Join thousands of women across the U.S. who've made Mass & Slim part of their everyday routine. Comfortable shaping, real circulation support, and a sculpted silhouette you can wear all day.
Start with one pair, or save with a daily rotation.
Shop the Shorts 3-Pack and save $64 Prefer one pair? Choose my size60-Day Money-Back Guarantee · Free Size Exchanges · Secure Checkout
Mass & Slim Shapewear Leggings
High-waisted, full-length anti-cellulite shapewear leggings
Tourmaline beads embedded in the fabric give a gentle micro-massage, while the high waist smooths your waistline, lifts the buttocks and shapes your hips, thighs, calves and ankles the moment you put them on.
Made for nurses, moms, professionals and women over 45 who are on their feet all day. Most shapewear squeezes and compresses. Mass & Slim works with your body, with instant shaping and visible improvements with consistent wear.
- 60-day full refund, even if worn
- Free size exchanges
- Free U.S. shipping, 3 to 4 days
- Afterpay: 4 easy payments
One-time purchase. No subscription.
Clinically Tested. Independently Verified.
In a 30-day third-party clinical study, women who wore Mass & Slim 8 hours a day saw:
*Third-party clinical study: 30 women wore the shorts 8 hours a day for 30 days with a balanced diet. No control group. Individual results may vary.
Watch them in action
What Mass & Slim shapewear wearers say
Critical care nurse"I am a critical care nurse and these leggings are saving my legs. I am no longer feeling leg fatigue at the end of my shift… In addition my legs look smoother. My husband noticed the back of my thighs appeared less dimpled and he was a skeptic. I am ordering a second pair."
Leann K., verified buyer
On her feet 10+ hours"I work in manufacturing and on feet 10+ hours a day… I have had no 'roll' issues like many brands of [shapewear] I have tried, these stay in place."
Elaine K., verified buyer
Was skeptical"I was skeptical but after wearing them so far for three weeks I am visibly noticing a difference in my cellulite on my upper legs… They don't make me feel hot."
Keli A., verified buyer
Size check"These leggings are sooo comfortable, you won't want to take them off! I am a size 14 and a size L worked perfectly."
Bonnie C., verified buyer
Fourth pair"This is the fourth pair I have gotten over the years… it's almost like wearing compression socks on my whole legs."
Nancy J., verified buyer
Why women choose full-length shapewear leggings
- Smooths the appearance of cellulite from waist to ankle, and helps smooth it further with consistent wear
- Shapes hips, thighs and calves, and lifts the buttocks
- Supports healthy circulation and lymphatic flow
- Breathable, cooling comfort for 8 to 12 hour wear
- Invisible under jeans, scrubs, dresses and work pants
Why full-length instead of shorts?
Leggings shape from your waistline to your ankles, calves included. The gentle full-length support and Tourmaline micro-massage help tired, heavy legs feel lighter and more comfortable. Best under pants, jeans, scrubs and longer outfits.
Will they roll down or dig in?
No. The high-waisted, seamless design stays put, even after long hours on your feet. Unlike traditional shapewear that pinches and rolls, they move with your body. The seamless design sits smoothly under clothing without adding bulk.
Shapewear leggings size chart: find your size
Order your true U.S. size, not smaller. Size up only if you're between two sizes. For example, between Medium and Large, choose Large.
| Size | Hip | Waist | Height and weight (approx.) |
|---|---|---|---|
| SmallUS 6 / 8 | 36 to 38" | 26 to 28" | 4'11" to 5'6" 115 to 135 lbs |
| MediumUS 10 / 12 | 39 to 41" | 29 to 31" | 5'2" to 5'8" 135 to 160 lbs |
| LargeUS 14 / 16 | 42 to 44" | 32 to 34" | 5'4" to 6'0" 160 to 185 lbs |
| Extra LargeUS 18 / 20 | 45 to 47" | 35 to 37" | 5'5" to 6'2" 185 to 215 lbs |
Wrong size? Exchanges are free. Email info@theblackpurple.com with your order number and the size you'd like. We send a prepaid label and ship your new size at no cost.
Try Mass & Slim Leggings for 60 days
Wear them under your scrubs, your favorite jeans, your work pants. Feel the difference in the first few hours, and see the difference over 30 days.
Wear them for 30 days (the length of our clinical study*). Not happy? You still have 60 days from delivery for a full refund, even if you've worn them.
60-Day Money-Back Guarantee. Free size exchanges. Free U.S. standard shipping. Trusted by Nurses and Moms Across the U.S.
One pair or three
Anti-cellulite leggings 3-Pack: one to wear, one in the wash, one ready
The 30-day routine works best with a fresh pair each day, and the women who see the best results wear them daily. They are machine washable and dryer safe.
Two singles cost $195.90. The 3-Pack is $229.85, just $33.95 more for a third pair.
1 pair
$97.95 $109.95
$97.95 per pair
- Pick your size in the buy box at the top
- Or 4 interest-free Afterpay payments of $24.49
- Free exchanges if the size is not right
Choose your size at the top of this page.
Leggings 3-Pack
$229.85 $293.85
$76.62 per pair
- Three pairs, one size for all (between sizes? size up)
- Saves $64 vs three singles ($293.85)
- Or 4 interest-free Afterpay payments of $57.46
- Free exchanges if the size is not right
Want a full set? The Complete Shapewear Bundle (shorts, leggings and waist shaper) is $199.85 and saves $64 vs buying the three separately.
How Tourmaline micro-massage works in these leggings
Hundreds of small Tourmaline beads are embedded directly into the fabric. As you move throughout your day, the beads create a gentle, continuous micro-massage against the skin. That subtle stimulation helps support:
- Healthy circulation and lymphatic flow, keeping blood flowing through tired legs
- Lighter-feeling legs, especially around calves and ankles, and valuable for women who stand all day
- Smoother-looking skin, softening the visible appearance of cellulite over time
How to wear them
- Wear the leggings for 8 hours a day.
- As you move, the Tourmaline beads create a gentle micro-massage.
- Over 30 days, that consistent stimulation supports circulation and smoother-looking skin.
Your 30 day Mass & Slim plan
Week 1 to 2: Immediate shaping and smoothing. Many women say their legs already feel lighter, especially those on their feet all day.
Week 2 to 3: Skin may start to feel smoother. Some women notice their calves and ankles feel lighter after long days on their feet.
Week 3 to 4: Many report a visible improvement in the appearance of cellulite, with subtle changes around the waist, hips, thighs and calves.
Consistency is the key. The women who see the best results wear them daily.
Frequently asked questions about Mass & Slim Leggings
Order your true U.S. size, not smaller. Between two sizes? Size up. See the size chart. If the fit is off, exchanges are free: email info@theblackpurple.com and we ship your new size at no cost. U.S. standard shipping is free and takes 3 to 4 business days. Afterpay is available on every product: pay in 4 easy interest-free payments. One pair is 4 payments of $24.49, the 3-Pack is 4 payments of $57.46. Gentle, not firm. Unlike traditional shapewear that squeezes, these grey shapewear leggings are soft, stretchy and more elastic, and are built to work with your body. The firmer compression on our site belongs to the separate Black Compression Leggings, which are worn on their own. They mold to the shape of your body after 1 or 2 wears, becoming more comfortable over time, like a second skin. You have 60 days from delivery to decide, even if you have worn them. Yes to all day, and no, they should not make you feel hot. The breathable, cooling fabric is designed to help regulate temperature. Many customers wear them 8 to 12 hours daily under jeans, dresses, scrubs or work attire. "So comfortable, you can even sleep in them." The shaping is immediate. For visible improvements in the appearance of cellulite, we recommend 8 hours a day for 30 days. Most women notice changes within 4 weeks. In the clinical study, 73% saw a visible improvement in the appearance of cellulite, with up to 3.2 cm reduction around the hips and up to 2.3 cm around the thighs.* *Third-party clinical study: 30 women wore the shorts 8 hours a day for 30 days with a balanced diet. No control group. Individual results may vary. Yes. Nurses and healthcare professionals, busy moms, teachers, retail workers, stylists and servers are some of our most loyal customers.What size should I order? What if they don't fit?
Is shipping free? Can I pay in installments?
How tight is the compression?
Is there a break-in period?
Can I wear them all day? Will I feel hot?
Do they really work? How soon will I see results?
Are these good for nurses, moms and women over 45?
The Mass & Slim family. Choose what works for your life.
Every Mass & Slim product uses the same embedded Tourmaline bead technology, supporting circulation, lymphatic flow and the appearance of smoother skin. The difference is how you wear them.
Grey Shapewear. Soft, stretchy, worn UNDER your clothes.
Breathable shapewear for 8 to 12 hour wear at work, at home, or out, with more elasticity and flexibility. The grey collection enhances your silhouette by smoothing the stomach, lifting the buttocks, and softening the appearance of cellulite.
- Shapewear Leggings (you're here). Waist to ankle, with added support for calves and lower legs. Best under pants, jeans and scrubs.
- Leggings 3-Pack. Wear them daily and save $64.
- Shapewear Shorts, $87.95. Waist, hips and upper thighs. Best under dresses and skirts.
- Waist Shaper. Targeted waist and midsection support. Pairs with anything.
Black Compression Leggings. Worn ON THEIR OWN.
Fully opaque, squat-proof outerwear leggings with firmer compression, for the gym, errands or out for the day. They feel a little more snug at first, then stretch and mold to your body after a few wears. This style has its own sizing: size up one full size from your usual U.S. size. Shop Compression Leggings.
Shorts or leggings? Why not both? Many women own both and rotate them. Shorts under dresses and skirts, leggings under pants and scrubs.
Material and care
Composition: 53% Polyamide, 33% Polyester, 14% Elastane.
Care: Machine washable and dryer safe. For longest wear, use a gentle cycle in cold water and dry on low heat.
Ready to feel the difference?
Join thousands of women across the U.S. who've made Mass & Slim Leggings part of their everyday routine. Comfortable full-length shaping, real circulation support, and a sculpted silhouette from waist to ankle.
Shop the Leggings 3-Pack and save $64Prefer one pair? Choose your size at the top of this page.
60-Day Money-Back Guarantee · Free Size Exchanges · Free U.S. Shipping · Secure Checkout
A Smoother, More Defined Waist. Comfortable Enough to Forget You're Wearing It.
The Mass & Slim Anti-Cellulite Waist Shaper smooths, sculpts, and supports your midsection comfortably all day. Made with a breathable bamboo viscose smart textile and embedded Tourmaline® beads, this seamless waist shaper for women contours your waist and hips invisibly under clothing while helping support healthy circulation and smoother-looking skin over time. Designed for real women with real schedules, nurses, moms, professionals, and women over 45 who want comfortable shaping without the stiffness of a traditional waist trainer.
- Smooths and shapes the waist and hips invisibly under clothes
- Comfortable enough for 8 to 12 hour daily wear
- Helps support healthy circulation and lymphatic flow
- Helps smooth the appearance of cellulite over time
- Breathable bamboo viscose keeps you cool and comfortable
- Flexible compression supports movement without feeling restrictive
Why Women Love the Mass & Slim Waist Shaper
360° Invisible Shaping
The seamless, high-waisted design wraps your waist and hips for smooth, defined support that disappears under dresses, scrubs, uniforms, leggings, and everyday outfits. No visible lines, no bulk.
Comfortable Enough for a 12 Hour Shift
Unlike rigid waist trainers that pinch and dig in, the Mass & Slim Waist Shaper moves with your body. The breathable bamboo viscose stays cool against the skin and is flexible enough for a full range of motion, on busy days and during workouts.
Stays Put All Day
The high-waisted, stay-in-place fit helps prevent rolling during normal daily movement. No rolling, no sliding, no constant adjusting. Just confident, comfortable support from morning to night.
Perfect For
The Mass & Slim Waist Shaper has become a quiet favorite for:
- Nurses and healthcare professionals on long shifts
- Busy moms juggling work, kids, and everything in between
- Women over 45 who want comfortable, everyday shaping
- Professionals who need a comfortable waist shaper under dresses and work clothes
- Women looking for shapewear with circulation support
Long-Term, Clinically Tested Results
The Tourmaline® beads gently warm the skin and help stimulate blood and lymphatic circulation. Combined with their micro-massaging action, they help smooth the appearance of cellulite for a more toned-looking waistline over time.
In a 30-day study, participants who wore Mass & Slim experienced measurable results:
*Based on a clinical study conducted over 30 days on 30 women aged 18 to 55. Results may vary depending on individual morphology and usage conditions.
How Tourmaline® Micro-Massage Technology Works
Hundreds of small Tourmaline® beads are embedded directly into the fabric. As you move throughout your day, the beads create a gentle, continuous micro-massage against the skin. That subtle stimulation helps support:
- Healthy circulation, working with every movement
- Lymphatic flow, helping reduce puffiness around the midsection
- Smoother-looking skin, softening the visible appearance of cellulite over time
Wear it 8 to 12 hours daily. The breathable bamboo viscose keeps you cool while the micro-massage works with you throughout the day.
How to Wear It
- Wear the waist shaper for 8 hours a day.
- As you move, the Tourmaline® beads create a gentle micro-massage.
- Over 30 days, that consistent stimulation supports circulation and smoother-looking skin.
Your 30-Day Wear Experience
Week 1 to 2: Immediate shaping and smoothing. Your waist feels supported throughout the day.
Week 2 to 3: Skin around the midsection may begin to feel smoother. Some women notice reduced puffiness.
Week 3 to 4: Many women report visible improvements in waist contour and smoother-looking skin.
Consistency is the key. The women who see the best results wear it daily.
The Mass & Slim Family. Choose What Works for Your Life.
Every Mass & Slim product is powered by the same embedded Tourmaline® bead technology, supporting circulation, lymphatic flow, and the appearance of smoother skin. The difference is how you wear them and what they do underneath your outfit.
Mass & Slim Shapewear (Grey). Worn UNDER Your Clothes.
Soft, stretchy, breathable shapewear designed to be worn discreetly under your everyday outfits. More elasticity, more flexibility, and built for 8 to 12 hour wear at work, at home, or out.
- Waist Shaper (you're here). Targeted waist and midsection support. Pairs with any bottom, shorts, skirts, or pants.
- Shapewear Shorts. Shapes waist, hips, and upper thighs. Best under dresses, skirts, and shorter hemlines.
- Shapewear Leggings. Full-length shaping from waist to ankle. Best under pants, jeans, and longer outfits.
Mass & Slim Compression Leggings (Black). Worn ON THEIR OWN.
Fully opaque, squat-proof outerwear leggings with firmer compression than the grey shapewear. They feel a little more snug at first, then gradually stretch and mold to the shape of your body after a few wears, becoming extremely comfortable and personalized to your fit. Designed to be worn on their own at the gym, running errands, or out for the day. Shop Compression Leggings.
Material and Care
Smart textile: Breathable bamboo viscose fibers with embedded Tourmaline® beads.
Care: Machine washable. For longest wear, wash on a gentle cycle in cold water and dry on low heat.
Try Mass & Slim for 60 Days, Completely Risk-Free
Slip it on. Wear it under your scrubs, your favorite dress, your work clothes. Feel the smooth, defined support in the first few hours, and see the difference over 30 days.
If you don't love how it feels, how it fits, or the results you see, return or exchange it within 60 days, no questions asked. Free size exchanges. Free returns.
✓ 60-Day Money-Back Guarantee · ✓ Free Size Exchanges · ✓ Trusted by Nurses and Moms Across the U.S.
Frequently Asked Questions
One size chart for the entire Mass & Slim collection. True to women's U.S. sizing. ← Swipe to see full chart → Grey Shapewear (Waist Shaper, Shorts, Leggings): Order your true U.S. size. Size up only if you're between two sizes. For example, between Medium and Large, choose Large. Black Compression Leggings (outerwear): These have firmer compression. Size up one full size from your usual U.S. size for the most comfortable fit. They will feel snug at first, then stretch and mold to your body shape after a few wears. As you wear it, the fabric gradually stretches and molds to the natural shape of your body, becoming more comfortable over time, like a second skin. No. The Mass & Slim Waist Shaper is designed with a high-waisted, stay-in-place fit that helps prevent rolling during normal daily movement. Most customers wear it comfortably for 8 to 12 hours without needing adjustments. A waist shaper can help smooth and contour the waistline, improve how outfits fit, and provide gentle support throughout the day. The Mass & Slim Waist Shaper also features Tourmaline® bead technology designed to help support healthy circulation while helping smooth the appearance of cellulite over time. Yes. The seamless bamboo viscose fabric is designed to stay discreet under dresses, scrubs, uniforms, leggings, and everyday clothing without visible lines. Many customers choose the Mass & Slim Waist Shaper for gentle everyday support and smoothing. The breathable bamboo fabric and flexible compression provide comfortable support without the stiffness of traditional waist trainers. Important: always consult your healthcare provider after childbirth before using compression garments. Traditional waist trainers mainly focus on tight compression. The Mass & Slim Waist Shaper combines comfortable shaping support with Tourmaline® micro-massage technology designed to help support circulation and smoother-looking skin over time, so you get instant smoothing plus gradual benefits with consistent wear. Yes. The breathable bamboo viscose is lightweight, flexible, and designed for extended wear, ideal for nurses, moms, professionals, and busy women on their feet all day. The Mass & Slim Waist Shaper is clinically tested to help smooth the appearance of cellulite when worn consistently for 8 to 12 hours daily over time. We offer free 60-day returns and size exchanges. If your first size isn't perfect, we'll help you find the right fit. The bamboo viscose fabric is naturally soft, breathable, and cooling. Most customers with sensitive skin find it comfortable for everyday wear.Size Chart and Fit Guide
Size
US Size
Hip
Waist
Height
Weight (approx.)
Small
6 / 8
36 to 38"
26 to 28"
4'11" to 5'6"
115 to 135 lbs
Medium
10 / 12
39 to 41"
29 to 31"
5'2" to 5'8"
135 to 160 lbs
Large
14 / 16
42 to 44"
32 to 34"
5'4" to 6'0"
160 to 185 lbs
Extra Large
18 / 20
45 to 47"
35 to 37"
5'5" to 6'2"
185 to 215 lbs
Do waist shapers roll down or roll up during the day?
What are the benefits of wearing a waist shaper?
Can I wear this waist shaper under dresses or work clothes?
Is this a good waist shaper for postpartum support?
How is this different from a regular waist trainer?
Is the waist shaper comfortable enough for all-day wear?
Can a waist shaper help smooth the appearance of cellulite?
What if my size doesn't fit?
Is this waist shaper suitable for sensitive skin?
Ready to Feel the Difference?
Join thousands of women across the U.S. who've made Mass & Slim part of their everyday routine. Comfortable shaping, real circulation support, and a smoother, more defined waist you can wear all day.
60-Day Money-Back Guarantee · Free Size Exchanges · Secure Checkout
Mass & Slim Compression Leggings (Black)
Black anti-cellulite compression leggings: order one size up
Here's the honest part first. These are firm compression leggings, made to be worn on their own, out of the house, with nothing over them. They feel snug when you first put them on, and that's on purpose. Order one full size up, give them a few wears, and the fabric molds to the shape of your body.
Your size: one full size up
Why size up? These are true compression leggings, and compression is made to fit snug. If you're not used to wearing compression, that can feel tight at first. That's why we suggest you size up one full size from your usual U.S. size. They're also firmer than our grey shapewear.
| Your usual size | Order this size |
|---|---|
| SmallUS 6 / 8 | MediumUS 10 / 12 |
| MediumUS 10 / 12 | LargeUS 14 / 16 |
| LargeUS 14 / 16 | Extra LargeUS 18 / 20 |
| Extra LargeUS 18 / 20 | Check the chartExtra Large is our largest size |
Usual size Extra Large? It's our biggest size, so use the size chart below to pick by your hip and waist. Not sure of your size? Same chart. Size exchanges are free.
Snug at first is a feature
That tight feeling is the fabric doing its job. It stretches and molds to the shape of your body after a few wears, and then it just feels like yours.
The fit"They fit really snug. But not unbearably so."
Heather W.
Stretches out"I bought more because the ad said they stretch out. My other pairs are 2 years old."
Shawn L.
- 60-day full refund, even if worn
- Free size exchanges
- Free U.S. shipping, 3 to 4 business days
Size Chart and Fit Guide for black compression leggings
One size chart for the whole Mass & Slim collection, based on standard women's U.S. sizing.
← Swipe to see the full chart →
| Size | US Size | Hip | Waist | Height | Weight (approx.) |
|---|---|---|---|---|---|
| Small | 6 / 8 | 36 to 38" | 26 to 28" | 4'11" to 5'6" | 115 to 135 lbs |
| Medium | 10 / 12 | 39 to 41" | 29 to 31" | 5'2" to 5'8" | 135 to 160 lbs |
| Large | 14 / 16 | 42 to 44" | 32 to 34" | 5'4" to 6'0" | 160 to 185 lbs |
| Extra Large | 18 / 20 | 45 to 47" | 35 to 37" | 5'5" to 6'2" | 185 to 215 lbs |
Black Compression Leggings (you're here): As the name says, these are true compression leggings worn as outerwear, so they fit firmer and feel snug. Size up one full size from your usual U.S. size. Tip: if you wear a Medium in our grey Mass & Slim shapewear, order a Large in the black compression leggings. The compression fabric fits more snugly, while the grey shapewear has more stretch so it sits comfortably under your clothes.
Grey Shapewear (Shorts, Leggings, Waist Shaper): Order your true U.S. size. Size up only if you're between two sizes. For example, if you're between a Medium and a Large, go with the Large.
Wrong size? Exchanges are free. If your first pair isn't quite right, we'll help you find the perfect size.
Wrong size"I ordered the wrong size and they were quick to send me my correct size! Excellent customer service!"
Summer, verified buyer
How to put them on
They're easy to put on with the right technique. Here's the easiest way.
- Start with gentle hands. Keep sharp nails away from the fabric.
- Roll the top inside out. Fold the waistband down so the top part of the leggings is turned inside out.
- Put in each leg. Step in one leg at a time and ease them up over your calves and knees.
- Roll it up over your hips and thighs. Once you get to your thighs, roll the top back over and up into place at your waist, smoothing as you go.
- Give them a few wears. The fabric stretches and molds to the shape of your body, so they feel more like yours every time.
Fully opaque, squat-proof, and made to be worn on their own
These black anti-cellulite compression leggings are made to be worn on their own as outerwear. The premium black fabric is:
- Completely opaque
- Squat-proof
- No see-through
- Gym-ready
You can wear them out the door and not think about it. They look like high-end fashion leggings while quietly doing the work of anti-cellulite compression.
Tap below to watch Tanya in an XL and another customer in a Medium.
See Mass & Slim Compression Leggings in Action
Tanya is wearing size XL
Customer wearing size Medium
A waistband that stays put, and comfort for a long day
The waistband
The high waistband smooths your midsection and stays put all day. No rolling, no sliding, no constant tugging. Just a sleek, sculpted shape that stays comfortable through workouts, errands, and everything in between.
The waistband"These leggings are very comfortable, the waist band does not roll down, the compression is just right."
Cheryl I.
Cool, breathable, and made for long days on your feet
Made with a breathable, lightweight smart textile, the fabric has a cool feel against your skin, so even during a workout or a long day on your feet, these leggings help keep you comfortable instead of hot. Soft, flexible, and moisture-wicking, with strong compression support that lasts. Many women wear theirs 8 to 12 hours a day.
End of the day"After wearing them for a full day, I felt a major difference. My legs didn't feel half as heavy as usual by the end of the day."
Heather W.
How to wear them: gym, errands, or out for the day
Wear your black anti-cellulite compression leggings on their own. Put them on and go.
- At the gym. Squat-proof and gym-ready.
- Running errands. The high waistband stays put, with no constant tugging.
- Out for the day. They look like high-end fashion leggings.
- Travel days. Breathable cooling comfort for errands, travel and workouts.
For the best results
- Wear the leggings about 8 hours a day, for at least 30 days.
- As you move, the Tourmaline® beads create a gentle micro-massage.
- Over time, that steady massage helps support circulation and smoother-looking skin.
Supportive Compression. Sculpted Confidence. Smoother-Looking Legs in 30 Days.
You're wondering if they work. Fair question, so here's the plain answer.
Mass & Slim Compression Leggings combine supportive, sculpting compression with Tourmaline® micro-massage technology to shape your figure, support circulation, and smooth the look of cellulite over time. They're high-waisted, fully opaque, and squat-proof, made to be worn on their own at the gym, running errands, or anywhere you want smoother, more sculpted legs.
Most compression leggings just squeeze. Mass & Slim works with you as you move, giving you instant shaping now and gradual results with regular wear.
- Helps smooth the appearance of cellulite
- Lifts and shapes the buttocks for a rounder, more sculpted look
- Supports healthy blood and lymph flow
- Firm, high-waisted compression that shapes you from waist to ankle
- Breathable, cooling fabric that keeps you comfortable, not hot
- Fully opaque and squat-proof outerwear
- Made for 8 to 12 hours of daily wear
Held in"These are absolutely heavenly! They hold you in and seems to be diminishing the cellulite a bit. Love them!"
Janis K.
Sculpting compression that lifts and shapes
These give you firmer compression than our grey shapewear line, with a supportive, tummy-control hold that lifts your buttocks and shapes your waist, hips, thighs, and calves. The result is a smooth, confident silhouette that looks as good as it feels. You feel held in, and you can leave the house in leggings on their own.
Anti-cellulite support technology
As you walk, move, or work out, the embedded Tourmaline® beads help support:
- Healthy blood circulation
- Lymphatic flow
- Less fluid retention
- Smoother-looking skin over time
Clinically tested. Independently verified.
In a 30-day third-party clinical study, participants who wore Mass & Slim 8 hours a day experienced:
*Results based on Third-party clinical study: 30 women wore the shorts 8 hours a day for 30 days with a balanced diet. No control group. Individual results may vary.
What Mass & Slim means, and how the Tourmaline® micro-massage works
Mass & Slim stands for Massage and Slimming. The secret is in the fabric, a smart compression textile with hundreds of Tourmaline® beads woven right in, working against your skin to help refine your shape over time. It works in two ways:
- Right away: A firm, corset-like hold instantly sculpts and smooths your belly, buttocks, and thighs for a more defined shape that stays comfortably in place.
- Over time: With regular wear, the gentle micro-massage from the Tourmaline® beads helps improve your blood and lymph flow, which helps smooth the look of cellulite and reduce inches.
Hundreds of small Tourmaline® beads are embedded right into the fabric. As you move through your day, the rounded beads create a gentle, steady micro-massage against your skin. With regular wear, that massaging effect helps improve your blood and lymph flow over time, which helps smooth the look of cellulite and reduce inches.
Your 30-day Mass & Slim plan
Here's the month, week by week.
Weeks 1 to 2: Instant shaping and firm support. Your legs often feel more supported while you're up and moving.
Weeks 2 to 3: Your skin may start to feel smoother. Some women notice less puffiness or swelling.
Weeks 3 to 4: Many women report a smoother look to cellulite and a few inches lost.
Consistency is everything. The women who see the best results wear them regularly.
Made for women with busy lives
If you're on your feet all day, you're who we made these for. Mass & Slim Compression Leggings have become a quiet favorite for:
- Nurses and healthcare workers on long shifts
- Women who are on their feet all day
- Busy moms juggling everything at once
- Women over 45 who care about circulation and shape
- Women who want anti-cellulite leggings that fit right into their routine
- Women dealing with leg fatigue, swelling, varicose veins, lymphedema concerns, or post-workout recovery
Try them for 60 days
Slip them on. Wear them to the gym, around town, or out for the day. You'll feel the firm support and sculpted shape right away, and see the difference over 30 days as the fabric molds to your body like a second skin.
Not sure about the fit or the feel? You have a 60-day full refund, even if worn. Free size exchanges too, and free U.S. shipping in 3 to 4 business days.
60-Day Money-Back Guarantee · Free Size Exchanges · Rated 4.47/5 by Real Customers
Wearing them under clothes? Try the grey shapewear
Every Mass & Slim piece is built on the same smart compression textile with embedded Tourmaline® beads to help support circulation, lymph flow, and smoother-looking skin. The difference is how you wear them and how firm the compression feels.
Mass & Slim Shapewear (Grey). Worn UNDER Your Clothes.
Soft, stretchy, breathable shapewear made to disappear under your everyday outfits. More stretch, more flexibility, and built for 8 to 12 hours of wear at work, at home, or out and about. The grey collection smooths your stomach, lifts your buttocks, and softens the look of cellulite. Order your true size.
- Shapewear Leggings. Full-length shaping from waist to ankle. Best under pants, jeans, and longer outfits.
- Shapewear Shorts. Shapes your waist, hips, and upper thighs. Best under dresses, skirts, and shorter hemlines.
- Waist Shaper. Targeted waist and midsection support. Pairs with anything.
A lot of women own both. The black compression leggings for days they want stronger sculpting out in the open, and the grey shapewear for invisible smoothing under everyday clothes.
Fabric, care & safety
Composition: 61.3% Polyamide, 28.5% Polyester, 10.2% Spandex.
Care: Machine wash on a gentle cycle in cold water. Hang dry, or use a low temperature setting if you use a dryer.
Please wear them safely:
- Never wear them over open wounds, or on skin that's swollen, inflamed, or irritated.
- Don't wear them if you've had surgery recently or if you're pregnant.
- If you have any health concerns, check with your healthcare provider before use.
Your questions, answered
Order one full size up from your usual U.S. size. Compression leggings are made to fit snug, and if you're not used to compression, that can feel tight at first. Sizing up gives you a more comfortable fit. If you wear a Medium in our grey shapewear, order a Large in these. See the size chart. It's all in the technique. Roll the top inside out, put in each leg, and once you get to your thighs, roll it back over your hips and up to your waist. Use gentle hands and keep sharp nails away from the fabric. After a few wears, the fabric molds to your shape. See how to put them on. That's on purpose. The firm compression fabric is meant to feel tight when it's new. After three or four wears, it relaxes and molds to your body for a personalized fit that feels like a second skin. Yes. The premium black fabric is fully opaque and squat-proof, with no see-through. They look like high-end fashion leggings while giving you all the benefits of anti-cellulite compression. Wear them to the gym, around town, or out for the day with full confidence. No. The high waistband stays put all day. No rolling, no sliding, no constant tugging. Yes. The breathable fabric keeps you comfortable all day long, and plenty of customers wear them 8 to 12 hours daily, including during workouts. For the best results, wear them 8 hours a day for at least 30 days. Just the opposite. Mass & Slim Compression Leggings are made with a breathable fabric that has a cool feel, so you stay comfortable during workouts, long shifts, and warm days. Here's the honest answer. You get instant shaping now and gradual results with regular wear, so give them time. Wear them 8 hours a day for at least 30 days. Visible results in 30 days*. *Results based on Third-party clinical study: 30 women wore the shorts 8 hours a day for 30 days with a balanced diet. No control group. Individual results may vary. Then we make it easy. You have a 60-day full refund, even if worn, and free size exchanges. If your first pair isn't quite right, we'll help you find the perfect size. Choose by the size chart. The fabric is stretchy, so it adapts to your height and shape. Both use the same smart compression textile with embedded Tourmaline® beads. The difference is how firm they feel and how you wear them: Tourmaline® beads are embedded right into the fabric. As you move, they create a gentle micro-massage against your skin. With regular wear, that massaging effect helps improve your blood and lymph flow over time, which helps smooth the appearance of cellulite and reduce inches. Many women with lymphedema or lipedema reach for Mass & Slim Leggings for their firm but breathable compression. The Tourmaline® beads help support lymphatic flow and ease the feeling of swelling, which makes them comfortable for all-day wear. If you have a medical condition, please check with your healthcare provider before use. Absolutely. These are some of our most loyal customers. The mix of firm sculpting compression, circulation support, and all-day comfort is exactly what women on their feet all day are looking for.What size should I order?
What's the easiest way to put them on?
Why do the leggings feel snug at first?
Are they really squat-proof and fully opaque?
Will the waistband roll down?
Can I wear them all day?
Will they make me feel hot?
Do they really work?
What if they don't fit?
How long are they? Will they fit my height?
What's the difference between the grey shapewear and the black compression leggings?
How do the Tourmaline beads work?
Are these good for lymphedema or lipedema?
Are these good for nurses, moms, and women over 45?
Ready to feel the difference?
Join the thousands of women across the U.S. who've made Mass & Slim Compression Leggings part of their everyday routine. Sculpting compression, real circulation support, and a confident shape that's made to be seen. Order one size up, give them a few wears, and let them become yours.
60-Day Money-Back Guarantee · Free Size Exchanges · Secure Checkout
One of Each. Complete Smoothing from Waist to Ankle.
The Mass & Slim Shapewear Bundle gives you all three of our anti-cellulite pieces — shorts, leggings, and a waist shaper — so you always have the right shaping for whatever you’re wearing. Every piece uses the same Tourmaline® micro-massage technology to help support circulation and the appearance of smoother skin.
- Helps smooth the appearance of cellulite from waist to ankle
- Tourmaline® micro-massage helps support circulation and lymphatic flow
- High-waisted, seamless fit — invisible under dresses, jeans, scrubs, and work pants
- The right piece for every outfit, plus layering options for extra midsection shaping
- Breathable, cooling comfort for 8 to 12 hour wear
What’s Included
All three come in the single size you select above. Not sure on size? See the sizing guide below.
Why Buy the Full Bundle Instead of One Piece?
1. The right shaping for every outfit
Shorts under dresses and skirts, leggings under pants and scrubs, and the waist shaper for tummy-focused days. With all three, you’re covered no matter what you put on.
2. Try all three and find your favorite
Not sure whether you prefer shorts, leggings, or the waist shaper? The bundle lets you wear each one and discover which fits your day best — before stocking up on the style you love.
3. Layer for extra smoothing
On days you want more midsection definition, wear the waist shaper over your shorts or leggings for an added smoothing layer.
4. Better value
You get all three pieces for $64 less than buying them separately — the saving is shown in the price above.
Shorts vs. Leggings vs. Waist Shaper
| Piece | What it shapes | Best worn | Coverage |
|---|---|---|---|
| Shorts | Waist, hips, upper thighs; lifts the buttocks | Under dresses, skirts, shorter hemlines | Waist to upper thigh |
| Leggings | Waist, hips, thighs, calves, ankles | Under pants, jeans, scrubs, longer outfits | Full length, waist to ankle |
| Waist Shaper | Tummy and midsection, firm and targeted | Under tops, or layered over shorts/leggings | Waist and core focus |
Every piece shares the same core benefits: Tourmaline® micro-massage, breathable cooling comfort, a high-waisted no-show fit, and the 60-day guarantee.
*Based on a 30-day third-party clinical study with 8 hours of daily wear. Individual results may vary.
Who the Bundle Is Best For
- Women who want the complete system — the right shaping for any outfit
- First-timers deciding which style they like best before stocking up
- Nurses and healthcare workers on long shifts
- Busy moms and women over 45 who want comfortable, all-day shaping
- Anyone committing to the full 30-day routine who wants every option on hand
- A thoughtful gift — one size covers all three pieces
How Tourmaline® Micro-Massage Works
Hundreds of tiny Tourmaline® beads are embedded directly into the fabric of each piece. As you move, they create a gentle, continuous micro-massage that helps support healthy circulation, lymphatic flow, and the appearance of smoother skin over time.
Want the full technology and clinical detail? See the shorts, leggings, and waist shaper pages.
See Mass & Slim in Action
A quick look at how the shapewear shapes, moves, and wears under everyday clothing.
Mass & Slim Anti-Cellulite Shapewear
How to Wear the Bundle
- Match the piece to your outfit: shorts under dresses and skirts, leggings under pants and scrubs, waist shaper under tops or layered over the shorts/leggings.
- Wear about 8 hours a day. As you move, the Tourmaline® beads create a gentle micro-massage.
- Rotate by day and by outfit so there’s always a clean, dry piece ready.
- Stay consistent for 30 days to support circulation and smoother-looking skin.
Consistency is everything. The women who see the best results wear a Mass & Slim piece every day.
Sizing Guidance
One size chart for the entire Mass & Slim collection. Order your true U.S. size; if you’re between two sizes, size up. The size you select applies to all three pieces.
About the waist shaper: it’s designed to sit firm for targeted midsection support, so it can feel snug at first. If you’re between sizes or prefer a gentler hold, size up.
← Swipe to see full chart →
| Size | US Size | Hip | Waist | Height | Weight (approx.) |
|---|---|---|---|---|---|
| Small | 6 / 8 | 36 to 38" | 26 to 28" | 4'11" to 5'6" | 115 to 135 lbs |
| Medium | 10 / 12 | 39 to 41" | 29 to 31" | 5'2" to 5'8" | 135 to 160 lbs |
| Large | 14 / 16 | 42 to 44" | 32 to 34" | 5'4" to 6'0" | 160 to 185 lbs |
| Extra Large | 18 / 20 | 45 to 47" | 35 to 37" | 5'5" to 6'2" | 185 to 215 lbs |
Composition: 53% Polyamide, 33% Polyester, 14% Elastane. Care: Machine washable and dryer safe; gentle cycle, cold water, low heat for longest wear.
Try the Bundle for 60 Days, Risk-Free
Wear each piece daily. Feel the shaping in the first few hours and see the difference over 30 days. If you don’t love the feel, fit, or results, return or exchange within 60 days.
✓ 60-Day Money-Back Guarantee · ✓ Free Size Exchanges · ✓ Trusted by Nurses and Moms Across the U.S.
Ready to Start Your 30 Days?
Select your size above and add the bundle to your cart — shorts, leggings, and waist shaper, everything you need for the full routine.
60-Day Money-Back Guarantee · Free Size Exchanges · Secure Checkout
Explore the Mass & Slim Family
- Anti-Cellulite Shorts — or stock up with the Shorts 3-Pack.
- Anti-Cellulite Leggings — or stock up with the Leggings 3-Pack.
- Waist Shaper — targeted midsection support on its own.
- Read verified customer reviews
Mass & Slim Shorts 3-Pack
Anti-cellulite shapewear shorts 3-pack: one to wear, one in the wash, one ready
High-waisted, seamless shaping shorts with Tourmaline® beads embedded in the fabric. They smooth your waist, lift the buttocks and shape your hips and thighs, while the beads give a gentle micro-massage that supports circulation and lymphatic flow. Made for nurses, moms and every woman 40+ on her feet all day. With three pairs, you can wear them every day and never wait on the laundry.
- One size for all three pairs
- Free U.S. shipping, 3 to 4 business days
- Free size exchanges
- 60-day full refund, even if worn
- Helps smooth the appearance of cellulite with consistent wear*
- Visible results in 30 days*
- Smooths your waist and shapes your hips and thighs under dresses, jeans and scrubs
- Seamless and high-waisted, invisible under clothing, with no rolling, pinching or visible lines
- Breathable, cooling comfort for 8 to 12 hour wear
*Third-party clinical study: 30 women wore the shorts 8 hours a day for 30 days with a balanced diet. No control group. Individual results may vary.
Not sure of your size? See the size chart. One size covers all three pairs.
Clinically tested. Independently verified.
In a 30-day third-party clinical study, women who wore Mass & Slim Shorts 8 hours a day saw:
*Third-party clinical study: 30 women wore the shorts 8 hours a day for 30 days with a balanced diet. No control group. Individual results may vary.
▶ Watch them in action
What women are saying
On a 10 hour shift"I'm a nurse, these are amazing under my scrubs. It's like a booty massage for my 10 hour shifts."
Cyndee L., verified buyer
No rolling"Most everything I've tried out on the market has always rolled. These stay put!"
Caroline S., verified buyer
Holds in, not tight"They hold everything in without feeling tight."
Nancy B., verified buyer
Under a dress"I wore them under a dress for a party. They gave great support while being super comfortable."
Pietra A., verified buyer
All-day wear"Shorts are comfortable for all day wear under any garment of clothing. Loving these!"
Kate S., verified buyer
The things you worry about, answered
Will they roll down?
No. The high-waisted, seamless design stays put and doesn't roll down or pinch, even after hours on your feet.
Will they show under my clothes?
No. They sit smooth and flat under dresses, skirts, jeans, scrubs and work pants, so no one will know they're there. Under very thin or skin-tight fabric, pair them with a slightly heavier layer for the smoothest look.
Will they be comfortable on a long shift?
Unlike traditional shapewear that squeezes, Mass & Slim Shorts move with your body. The breathable, cooling fabric sits smoothly against the skin, made for 8 to 12 hour wear.
Will my tired, heavy legs feel lighter?
For women on their feet all day, the gentle support and Tourmaline® micro-massage help legs feel lighter and more comfortable throughout the day.
Find your size: one size covers all three pairs
Order your true U.S. size, not smaller. Size up only if you're between two sizes. For example, between Medium and Large, choose Large. All three pairs come in the size you select, so this one choice is the whole decision.
| Size | Hip | Waist | Height and weight (approx.) |
|---|---|---|---|
| SmallUS 6 / 8 | 36 to 38" | 26 to 28" | 4'11" to 5'6" 115 to 135 lbs |
| MediumUS 10 / 12 | 39 to 41" | 29 to 31" | 5'2" to 5'8" 135 to 160 lbs |
| LargeUS 14 / 16 | 42 to 44" | 32 to 34" | 5'4" to 6'0" 160 to 185 lbs |
| Extra LargeUS 18 / 20 | 45 to 47" | 35 to 37" | 5'5" to 6'2" 185 to 215 lbs |
One size chart for the entire Mass & Slim collection, true to women's U.S. sizing. As you wear them, the fabric gradually stretches and molds to the natural shape of your body, becoming more comfortable over time, like a second skin.
Wrong size? Exchanges are free. Email info@theblackpurple.com with your order number and the size you'd like. We send a prepaid label and ship your new size at no cost.
Plan your rotation
Why three pairs instead of one
The clinical study had women wear the shorts 8 hours a day for 30 days.* Consistency is the key, and the women who see the best results wear them daily. With the anti-cellulite shapewear shorts 3-pack, a simple rotation keeps one pair always ready. They are machine washable and dryer safe.
1 pair
$87.95
$87.95 per pair
Want to try one pair first? Choose your size on the Shorts page.
Choose my size, 1 pairShorts 3-Pack
$199.85
$66.62 per pair
- Three pairs: one to wear, one in the wash, one ready
- Saves $64 vs three separate pairs ($263.85)
- Free U.S. shipping and free size exchanges
Pick your size above and tap Add to cart.
Want a full set instead of three pairs of shorts? The Complete Shapewear Bundle (shorts, leggings and waist shaper) is $199.85.
Savings are measured against buying the same items one at a time at today's prices.
How the Tourmaline® micro-massage works
Hundreds of small Tourmaline® beads are embedded directly into the fabric. As you move through your day, the beads create a gentle, continuous micro-massage against the skin. That subtle stimulation helps support:
- Healthy circulation, keeping blood flowing through tired legs
- Lymphatic flow, for lighter-feeling legs
- Smoother-looking skin, softening the visible appearance of cellulite over time
How to wear them: wear one pair about 8 hours a day, every day, for 30 days. Rotate your three pairs through the wash. See the single Shorts page for more on the fabric.
Try the 3-Pack for 60 days
Wear them for 30 days (the length of our clinical study*). Not happy? You still have 60 days from delivery for a full refund, even if you've worn them.
60-Day Money-Back Guarantee · Free Size Exchanges · Free U.S. Shipping
*Third-party clinical study: 30 women wore the shorts 8 hours a day for 30 days with a balanced diet. No control group. Individual results may vary.
Frequently asked questions
So you can wear them every day. One pair is on you, one is in the wash and one is ready for tomorrow. At $66.62 per pair, it is the best value per pair for daily wearers. Yes. All three pairs come in the one size you select. Order your true U.S. size, not smaller. Between sizes? Size up. The shaping is immediate. In the clinical study, women wore them 8 hours a day for 30 days and 73% saw a visible improvement in the appearance of cellulite.* Individual results may vary. Yes. The breathable, cooling fabric is designed for extended wear. Many customers, including nurses on 12 hour shifts, wear them 8 to 12 hours a day. We offer free size exchanges: email info@theblackpurple.com with your order number and the size you'd like, and we'll send a prepaid label and ship your new size at no cost. And if you're not happy, you have a 60-day full refund, even if worn. U.S. shipping is free and takes 3 to 4 business days. No. It is a one-time purchase. There is nothing to cancel. Yes. These are some of our most loyal customers: nurses on long shifts, busy moms, teachers, retail workers and anyone on their feet all day, who want comfortable shaping and lighter-feeling legs.Why three pairs?
Do all three pairs come in the same size?
How soon will I see results?
Can I wear them all day?
What if they don't fit?
How fast does it ship?
Is this a subscription?
Are these good for nurses, moms and women 40+?
The Mass & Slim family
- Shapewear Shorts. One pair. Waist, hips and upper thighs. Best under dresses and skirts.
- Shapewear Leggings. Waist to ankle. Best under pants and jeans.
- Waist Shaper. Targeted waist and midsection support.
- Complete Shapewear Bundle. Shorts, leggings and waist shaper in one set.
Read all verified customer reviews
Material: 53% Polyamide, 33% Polyester, 14% Elastane. Care: machine washable and dryer safe. For longest wear, use a gentle cycle in cold water and dry on low heat.
Three Pairs. Full-Length Smoothing. A Fresh Pair Every Single Day.
The Mass & Slim Anti-Cellulite Leggings work best when you wear them every day — and that’s exactly what the 3-Pack is built for. One pair on, one in the wash, one ready to go. You never skip a day, and skipping days is the main reason people don’t see results.
- Smooths the appearance of cellulite from waist to ankle
- Tourmaline® micro-massage helps support circulation and lymphatic flow
- High-waisted, seamless fit — invisible under pants, jeans, and scrubs
- Full-length support for thighs, calves, and ankles on long days
- Breathable, cooling comfort for 8 to 12 hour wear
- Enough pairs to wear daily for the full 30-day routine
What’s Included
Not sure on size? Use the sizing guide below — one chart covers the whole Mass & Slim collection.
Why the 3-Pack Instead of One Pair?
1. Daily wear is what gets results — rotation makes daily wear realistic
Mass & Slim Leggings are clinically tested to show visible results when worn 8 hours a day for 30 days. With one pair, laundry day means a missed day. With three, there’s always a clean, dry pair ready — so you actually finish the routine.
2. Better value
Three pairs cost less than buying them one at a time — the saving is shown in the price above.
3. All-day support, especially on your feet (or in a seat)
Full-length shaping with gentle calf-and-ankle support, ideal if you’re standing through a long shift or sitting for hours. A clean pair for work, one for errands or the gym, one in the wash.
What Each Pair Does for You
| Benefit | What it means for you |
|---|---|
| Tourmaline® micro-massage | Hundreds of embedded beads gently massage as you move, helping support circulation and lymphatic flow. |
| Smoother-looking skin | Consistent daily wear helps smooth the appearance of cellulite over time. |
| Full-length high-waisted shaping | Smooths the waistline and shapes hips, thighs, and calves from waist to ankle. |
| Breathable, cooling comfort | Built for 8 to 12 hour wear without rolling, pinching, or overheating. |
| Invisible under clothing | Seamless edges sit smoothly under pants, jeans, scrubs, and longer outfits. |
| Lighter-feeling legs | Gentle lower-leg support that’s especially welcome on long days standing or sitting. |
*Based on a 30-day third-party clinical study with 8 hours of daily wear. Individual results may vary.
Who the 3-Pack Is Best For
- Daily wearers who want a clean pair ready every morning
- Nurses and healthcare workers on long shifts
- People who sit for hours — drivers, desk workers, long commutes
- Busy moms juggling work, kids, and everything between
- Women over 45 who want comfortable shaping that respects their body
- Anyone committing to the full 30-day routine who doesn’t want laundry to interrupt it
How Tourmaline® Micro-Massage Works
Hundreds of tiny Tourmaline® beads are embedded directly into the fabric. As you move, they create a gentle, continuous micro-massage that helps support healthy circulation, lymphatic flow, and the appearance of smoother skin over time.
Want the full technology and clinical breakdown? See the single Mass & Slim Anti-Cellulite Leggings page.
See Mass & Slim in Action
A quick look at how the shapewear shapes, moves, and wears under everyday clothing.
Mass & Slim Anti-Cellulite Shapewear
How to Wear Them for Best Results
- Wear a pair for 8 hours a day — under your work clothes, errands outfit, or scrubs.
- At the end of the day, swap to the next clean pair and wash the one you wore.
- Repeat daily. With three in rotation, you always have a dry pair ready.
- Over 30 consistent days, the micro-massage supports circulation and smoother-looking skin.
Consistency is everything. The women who see the best results are the ones who never skip — which is exactly the problem three pairs solves.
Sizing Guidance
One size chart for the entire Mass & Slim collection. Order your true U.S. size; if you’re between two sizes, size up. All three pairs come in the size you select.
← Swipe to see full chart →
| Size | US Size | Hip | Waist | Height | Weight (approx.) |
|---|---|---|---|---|---|
| Small | 6 / 8 | 36 to 38" | 26 to 28" | 4'11" to 5'6" | 115 to 135 lbs |
| Medium | 10 / 12 | 39 to 41" | 29 to 31" | 5'2" to 5'8" | 135 to 160 lbs |
| Large | 14 / 16 | 42 to 44" | 32 to 34" | 5'4" to 6'0" | 160 to 185 lbs |
| Extra Large | 18 / 20 | 45 to 47" | 35 to 37" | 5'5" to 6'2" | 185 to 215 lbs |
Composition: 53% Polyamide, 33% Polyester, 14% Elastane. Care: Machine washable and dryer safe; gentle cycle, cold water, low heat for longest wear.
Try the 3-Pack for 60 Days, Risk-Free
Wear them daily. Feel the shaping in the first few hours and see the difference over 30 days. If you don’t love the feel, fit, or results, return or exchange within 60 days.
✓ 60-Day Money-Back Guarantee · ✓ Free Size Exchanges · ✓ Trusted by Nurses and Moms Across the U.S.
Frequently Asked Questions
The leggings are clinically tested to show results with daily wear for 30 days. Three pairs let you wear a clean pair every day while the others are washed or drying — so laundry never interrupts your routine. You also save $64 versus buying three separately. Yes. All three pairs are the single size you select above. If you need mixed sizes, order single pairs in each size instead. You save $64 versus buying three single pairs — the discount is shown in the price above. Both use the same Tourmaline® technology. Choose leggings for full-length shaping and calf/ankle support under pants, jeans, and scrubs. Choose shorts for waist, hip, and upper-thigh shaping under dresses and skirts. Many women own both. The shaping effect is immediate. For visible improvement in the appearance of cellulite, wear them about 8 hours a day for 30 days. Most women notice changes within 4 weeks. Individual results may vary. Yes. The breathable, cooling fabric is built for extended wear — many customers, including nurses and drivers, wear them 8 to 12 hours daily. No. The seamless, high-waisted design sits smoothly under clothing with no visible lines or bulk. We offer 60-day risk-free returns and free size exchanges on the full set. If the fit isn’t right, we’ll make it right.Why buy three pairs instead of one?
Do all three pairs come in the same size?
How much do I save with the 3-Pack?
Should I get the leggings or the shorts?
How soon will I see results?
Can I wear them all day?
Will they show under my clothes?
What if the size isn’t right?
Ready to Start Your 30 Days?
Select your size above and add the 3-Pack to your cart — everything you need to wear them daily, comfortably, for the full routine.
60-Day Money-Back Guarantee · Free Size Exchanges · Secure Checkout
Explore the Mass & Slim Family
- Single Anti-Cellulite Leggings — try one pair first, or read the full technology and clinical detail.
- Anti-Cellulite Shorts 3-Pack — waist, hip, and upper-thigh shaping under dresses and skirts.
- Waist Shaper — targeted midsection support that pairs with anything.
- Read verified customer reviews
