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Shape, Smooth, and Support All Day, Every Day
Designed for real women with real schedules. Nurses, moms, professionals, and women over 45 who want a smoother silhouette without the discomfort of traditional shapewear. Mass & Slim Shorts use embedded Tourmaline beads to gently support circulation and lymphatic flow while shaping your waist, hips, and thighs.
- Smooths the appearance of cellulite
- Lifts and shapes the hips and buttocks
- Supports healthy circulation and lymphatic flow
- Helps smooth the appearance of cellulite with consistent wear
- Breathable, cooling comfort for 8 to 12 hour wear
- Invisible under clothing, with no rolling, pinching, or visible lines
Why Women Over 45 Choose Mass & Slim Shorts
Instant Shaping You Can Feel
The high-waisted, seamless design smooths your waistline, lifts the buttocks, and shapes the hips the moment you put them on. Wear them under dresses, skirts, jeans, scrubs, or work pants. No one will know they're there.
Comfortable Enough for a 12 Hour Shift
Unlike traditional shapewear that squeezes, Mass & Slim Shorts move with your body. The breathable, cooling fabric sits smoothly against the skin, doesn't roll down, and doesn't pinch, even after hours on your feet.
Real Support for Tired, Heavy Legs
For women who are on their feet all day, the gentle support and Tourmaline micro-massage help legs feel lighter and more comfortable throughout the day.
Clinically Tested. Independently Verified.
In a 30-day third-party clinical study, participants who wore Mass & Slim Shorts 8 hours a day experienced:
Results based on a third-party clinical study. Individual results may vary.
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, 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.
Planning to wear them daily?
The 30-day routine works best with a fresh pair each day. The Shorts 3-Pack gives you three pairs and saves you $64 versus buying separately.
Shop the Shorts 3-Pack & Save $64 →Made for Women With Demanding Lives
Mass & Slim Shorts have 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 shaping that respects their body
- Professionals on their feet all day such as teachers, retail workers, stylists, and servers
- Women who want lighter-feeling legs after long hours on their feet
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 discreetly under your everyday outfits. More elasticity, more flexibility, and built for 8 to 12 hour wear at work, at home, or out. The grey collection enhances your silhouette by smoothing the stomach, lifting the buttocks, and softening the appearance of cellulite.
- Shapewear Shorts (you're here). Shapes waist, hips, and upper thighs. Best under dresses, skirts, and shorter hemlines.
- Shorts 3-Pack. The same shorts in a money-saving 3-pack — wear daily and save $64.
- Shapewear Leggings. Full-length shaping from waist to ankle. Best under pants, jeans, and longer outfits.
- Waist Shaper. Targeted waist and midsection support. Pairs with anything.
- Complete Shapewear Bundle. One shorts + one leggings + one waist shaper in a single set.
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.
Not sure which to choose? Many women own both. Our grey shapewear is soft, breathable, and discreet under everyday clothing for comfortable all-day wear, while our black compression leggings offer stronger sculpting and support designed to be seen and styled on their own.
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.
Try Mass & Slim for 60 Days, Completely Risk-Free
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.
If you don't love how they feel, how they fit, or the results you see, return or exchange them 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 (Shorts, Leggings, Waist Shaper): 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 them, the fabric gradually stretches and molds to the natural shape of your body, becoming more comfortable over time, like a second skin. Both use the same Tourmaline micro-massage technology. The difference is fabric and how you wear them: Yes. The breathable, cooling fabric is designed for extended wear. Many customers, including nurses on 12 hour shifts, wear them 8 to 12 hours daily. "So comfortable, you can even sleep in them." No. The fabric is breathable and cooling, comfortable even in warmer climates and during physical activity. 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. If the fit isn't right, we'll make it right. 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 effect 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. Yes. These are some of our most loyal customers. The combination of comfort, breathability, circulation support, and gentle shaping is specifically what women on their feet all day are looking for.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
What's the difference between the grey shapewear and the black compression leggings?
Can I wear them all day?
Will they make me feel hot?
Will they show under my clothes?
What if they don't fit?
How do the Tourmaline beads work?
How soon will I see results?
Are these good for nurses, moms, and women over 45?
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.
60-Day Money-Back Guarantee · Free Size Exchanges · Secure Checkout
Smooth, Shape, and Support from Waist to Ankle
Full-length anti-cellulite shapewear leggings designed for women with real schedules. Nurses, moms, professionals, and women over 45 who want a smoother silhouette and comfortable support from morning to night. Mass & Slim Leggings use embedded Tourmaline beads to gently support circulation and lymphatic flow while shaping your waist, hips, thighs, calves, and ankles.
- Smooths the appearance of cellulite from waist to ankle
- Shapes hips, thighs, calves, and lifts the buttocks
- Supports healthy circulation and lymphatic flow
- Helps smooth the appearance of cellulite with consistent wear
- Breathable, cooling comfort for 8 to 12 hour wear
- Invisible under jeans, scrubs, dresses, and work pants
Most shapewear squeezes and compresses. Mass & Slim works with your body. The innovative fabric moves with you, offering instant shaping and visible improvements with consistent wear.
Why Women Over 45 Choose Mass & Slim Leggings
Full-Length Shaping from Waist to Ankle
The high-waisted, seamless design smooths your waistline while sculpting your hips, thighs, calves, and ankles. A sleek silhouette that works invisibly under clothing, all day long.
Comfortable Enough for a 12 Hour Shift
Unlike traditional shapewear that pinches and rolls, Mass & Slim Leggings move with your body. The breathable, cooling fabric stays cool against the skin, doesn't roll down, and doesn't dig in, even after long hours on your feet.
Real Support for Tired, Heavy Legs
For women who are on their feet all day, the gentle full-length support and Tourmaline micro-massage help calves and ankles feel lighter and more comfortable throughout the day.
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 a third-party clinical study. Individual results may vary.
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, keeping blood flowing through tired legs
- Lymphatic flow, for lighter-feeling legs
- Lighter-feeling lower legs, especially around calves and ankles
- 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 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.
Planning to wear them daily?
The 30-day routine works best with a fresh pair each day. The Leggings 3-Pack gives you three pairs and saves you $64 versus buying separately.
Shop the Leggings 3-Pack & Save $64 →Made for Women With Demanding Lives
Mass & Slim Leggings have 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 shaping that respects their body
- Professionals on their feet all day such as teachers, retail workers, stylists, and servers
- Women who want lighter-feeling legs after long hours on their feet
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. The grey collection enhances your silhouette by smoothing the stomach, lifting the buttocks, and softening the appearance of cellulite.
- Shapewear Leggings (you're here). Full-length shaping from waist to ankle, with added support for calves and lower legs. Best under pants, jeans, scrubs, and longer outfits.
- Leggings 3-Pack. The same leggings in a money-saving 3-pack — wear daily and save $64.
- Shapewear Shorts. Shapes waist, hips, and upper thighs. Best under dresses, skirts, and shorter hemlines.
- Waist Shaper. Targeted waist and midsection support. Pairs with anything.
- Complete Shapewear Bundle. One shorts + one leggings + one waist shaper in a single set.
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.
Shorts or Leggings? Why not both? Many women own both styles and rotate them depending on the outfit. Shorts under dresses and skirts, leggings under pants and scrubs for full-length support and a smoother look from waist to ankle.
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.
Try Mass & Slim for 60 Days, Completely Risk-Free
Slip them on. 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.
If you don't love how they feel, how they fit, or the results you see, return or exchange them 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 (Shorts, Leggings, Waist Shaper): 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 them, the fabric gradually stretches and molds to the natural shape of your body, becoming more comfortable over time, like a second skin. Both use the same Tourmaline micro-massage technology and deliver the same core benefits. The right choice depends on your coverage needs: Many women own both styles and rotate them depending on what they're wearing that day. Both use the same Tourmaline micro-massage technology. The difference is fabric and how you wear them: Yes. The breathable, cooling fabric is designed for extended wear and helps keep you cool throughout the day. Many customers wear the leggings 8 to 12 hours daily under jeans, dresses, scrubs, or work attire. "So comfortable, you can even sleep in them." No. Mass & Slim Leggings are made with breathable, cooling fabric designed to help regulate temperature and keep you comfortable during extended wear. No. The seamless, high-waisted design sits smoothly under clothing while shaping your waist, hips, thighs, and calves without adding bulk. We offer 60-day risk-free returns and free size exchanges. If your first pair isn't the right fit, we'll help you find the perfect size. 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 effect 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. Yes. These are some of our most loyal customers. The combination of comfort, breathability, circulation support, and full-leg gentle shaping is specifically what women on their feet all day are looking for.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
Should I get the Shapewear Shorts or Shapewear Leggings?
What's the difference between the grey shapewear and the black compression leggings?
Can I wear them all day?
Will they make me feel hot?
Will they show under my clothes?
What if they don't fit?
How do the Tourmaline beads work?
How soon will I see results?
Are these good for nurses, moms, and women over 45?
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.
60-Day Money-Back Guarantee · Free Size Exchanges · Secure Checkout
Supportive Compression. Sculpted Confidence. Smoother-Looking Legs in 30 Days.
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.
- 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
- Fully opaque and squat-proof outerwear
- Breathable, cooling fabric that keeps you comfortable, not hot
- Made for 8 to 12 hours of daily wear
Most compression leggings just squeeze. Mass & Slim works with you as you move, giving you instant shaping now and gradual results with regular wear.
See Mass & Slim Compression Leggings in Action
Tanya is wearing size XL
Customer wearing size Medium
What Does Mass & Slim Mean?
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.
Why Women Love Mass & Slim Compression Leggings
Sculpting Compression That Lifts and Shapes
These leggings 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.
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
Fully Opaque Outerwear Leggings
Made to be worn on their own as outerwear. The premium black fabric is:
- Completely opaque
- Squat-proof
- No see-through
- Gym-ready
They look like high-end fashion leggings while quietly doing the work of anti-cellulite compression.
High-Waisted Sculpting Support
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.
Breathable, Cooling Comfort for All-Day Wear
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.
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 a third-party clinical study. Individual results may vary.
How Tourmaline® Micro-Massage Technology Works
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.
How to Wear Them
- 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.
Your 30-Day Mass & Slim Plan
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
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
The Mass & Slim Family. Pick What Fits Your Life.
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 Compression Leggings (Black). Worn ON THEIR OWN.
You're here. High-waisted outerwear leggings with firmer compression than the grey shapewear. They feel a little snug at first, then stretch and mold to your body after a few wears, becoming incredibly comfortable and made just for your shape. Wear them with confidence to the gym, running errands, or out for the day.
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.
- Shapewear Shorts. Shapes your 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.
- 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.
Try Mass & Slim for 60 Days, Risk-Free
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.
If you don't love how they feel, how they fit, or the results you see, return or exchange them within 60 days, no questions asked. Free size exchanges. Free returns.
✓ 60-Day Money-Back Guarantee · ✓ Free Size Exchanges · ✓ Rated 4.47/5 by Real Customers
Frequently Asked Questions
One size chart for the whole Mass & Slim collection, based on standard women's U.S. sizing. ← Swipe to see full chart → 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. Easy to put on: turn the leggings inside out, bunch up the legs, and roll them smoothly up over your hips and thighs. 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. Both use the same smart compression textile with embedded Tourmaline® beads. The difference is how firm they feel and how you wear them: 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. Yes. The breathable fabric keeps you comfortable all day long. For the best results, wear them 8 hours a day for at least 30 days. Plenty of customers wear them 8 to 12 hours daily, including during workouts. 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. 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. Please wear Mass & Slim safely: We offer 60-day risk-free returns and free size exchanges. If your first pair isn't quite right, we'll help you find the perfect size. 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.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
Why do the leggings feel snug at first?
What's the difference between the grey shapewear and the black compression leggings?
Are they really squat-proof and fully opaque?
Can I wear them all day?
Will they make me feel hot?
How do the Tourmaline beads work?
Are these good for lymphedema or lipedema?
Are there any safety precautions?
What if they don't fit?
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.
60-Day Money-Back Guarantee · Free Size Exchanges · 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
