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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 reduce inches over time
- Breathable bamboo-viscose for 8 to 12 hour comfort
- 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 bamboo-viscose blend is cooling against the skin, doesn't roll down, and doesn't pinch, even after hours on your feet.
Real Support for Circulation and Swelling
For women dealing with leg fatigue, swelling, varicose veins, or lymphatic concerns, the gentle compression and Tourmaline micro-massage help legs feel lighter and more supported 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, helping reduce puffiness and swelling
- 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 less puffiness and swelling in the legs.
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.
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 managing leg fatigue, swelling, varicose veins, or lymphedema concerns
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.
- 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.
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 bamboo-viscose 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 bamboo-viscose 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 reduce inches over time
- Breathable bamboo-viscose for 8 to 12 hour comfort
- 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 bamboo-viscose blend 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 dealing with leg fatigue, swelling, varicose veins, or lymphatic concerns, the gentle full-length compression and Tourmaline micro-massage help calves and ankles feel lighter and more supported 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, helping reduce puffiness and swelling
- Reduced fluid retention, 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 less puffiness and swelling in the calves and ankles.
Week 3 to 4: Many report visible improvements in the appearance of cellulite and reductions in inches around the waist, hips, thighs, and calves.
Consistency is the key. The women who see the best results wear them daily.
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 managing leg fatigue, swelling, varicose veins, or lymphedema concerns
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.
- 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.
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 bamboo-viscose 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 bamboo-viscose 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
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
Firm Compression. Sculpted Confidence. Smoother-Looking Legs in 30 Days.
Mass & Slim Compression Leggings combine firm sculpting compression with Tourmaline beads micro-massage technology to shape your silhouette, support circulation, and smooth the appearance of cellulite over time. Fully opaque, squat-proof outerwear leggings, designed to be worn confidently on their own at the gym, on errands, or anywhere you want sculpted, smooth-looking legs.
- Helps smooth the appearance of cellulite
- Supports healthy circulation and lymphatic flow
- Firm compression that sculpts waist to ankle
- Fully opaque, squat-proof outerwear
- Designed for 8 to 12 hour daily wear
- Premium look that feels as powerful as it looks
- Helps support post-workout muscle recovery and reduce leg fatigue
Unlike typical compression leggings that simply squeeze, Mass & Slim works with your body's movement, providing both instant shaping and gradual improvements with consistent 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 overall Slimming. The technology works in two ways:
- Massage: Embedded Tourmaline beads create a gentle micro-massage effect as you move, helping support circulation and lymphatic flow.
- Slimming: Sculpting compression fabric shapes, lifts, and smooths your waist, hips, thighs, and calves for a visibly smoother silhouette.
Together, these two actions help reduce the appearance of cellulite and improve body contouring over time.
Why Women Love Mass & Slim Compression Leggings
Sculpting Compression That Lifts and Shapes
These leggings offer firmer compression than the grey shapewear line, creating a supportive hold that sculpts your waist, hips, thighs, and calves. The result is a smooth, confident silhouette that looks as powerful as it feels.
Active Cellulite Support Technology
Tourmaline micro-massage beads are embedded directly into the fabric. As you walk, move, or exercise, the beads create gentle friction against the skin that helps support:
- Healthy circulation
- Lymphatic flow
- Reduced fluid retention
- Smoother-looking skin over time
Fully Opaque Outerwear Leggings
Unlike traditional shapewear, these leggings are designed to be worn as outerwear. The premium black compression fabric is:
- Completely opaque
- Squat-proof
- Non-transparent
- Gym-ready
They look like high-end fashion leggings while delivering the benefits of anti-cellulite compression technology.
High-Waisted Sculpting Support
The high waistband smooths the midsection and stays securely in place throughout the day. No rolling, no sliding, no constant adjusting. Just a sleek, sculpted silhouette that stays comfortable through workouts, errands, and everyday life.
Breathable Comfort for All-Day Wear
Made with a breathable bamboo-viscose blend, the fabric feels soft and flexible against the skin while maintaining strong compression support. Many customers wear their Mass & Slim Compression Leggings 8 to 12 hours daily.
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 woven 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 circulation, lymphatic flow, and the appearance of smoother skin 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, consistent stimulation supports circulation and smoother-looking skin.
Your 30 Day Mass & Slim Plan
Week 1 to 2: Immediate shaping and firm compression support. Legs often feel more supported during activity.
Week 2 to 3: Skin texture may begin to feel smoother. Some women notice reduced puffiness or swelling.
Week 3 to 4: Many customers report visible improvements in the appearance of cellulite and subtle reductions in inches.
Consistency is the key. The women who see the best results wear them regularly.
Made for Women With Demanding Lives
Mass & Slim Compression Leggings have become a quiet favorite for:
- Nurses and healthcare professionals on long shifts
- Women who work long hours on their feet
- Busy moms juggling daily responsibilities
- Women over 45 managing circulation and silhouette concerns
- Women who want cellulite-reducing leggings without changing their lifestyle
- Women managing leg fatigue, swelling, varicose veins, lymphedema concerns, or post-workout recovery
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 how firm the compression feels.
Mass & Slim Compression Leggings (Black). Worn ON THEIR OWN.
You're here. 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 confidently at the gym, running errands, or out for the day.
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 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.
- Waist Shaper. Targeted waist and midsection support. Pairs with anything.
Many women own both. Black compression leggings for days they want stronger sculpting on full display, and grey shapewear for invisible layering under everyday clothing.
Fabric 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 to the gym, on errands, or out for the day. 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 · ✓ Trusted by Women Across the U.S.
Frequently Asked Questions
One size chart for the entire Mass & Slim collection. Based on standard women's U.S. sizing. ← Swipe to see full chart → Black Compression Leggings (you're here): These are outerwear with firmer compression. Size up one full size from your usual U.S. size. They will feel snug at first, then stretch and mold to your body shape after a few wears for a personalized, sculpted fit. 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. 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. This is intentional. The firm compression fabric is designed to feel snug when new. After 3 to 4 wears, the fabric naturally stretches and molds to the shape of your body for a personalized, comfortable fit that feels like a second skin. Both use the same Tourmaline micro-massage technology. The difference is fabric and how you wear them: Yes. The premium black compression fabric is fully opaque, squat-proof, and non-transparent. They look like high-end fashion leggings while delivering anti-cellulite compression technology. Wear them to the gym, on errands, or out for the day with full confidence. Yes. The breathable bamboo-viscose blend keeps you comfortable during extended wear. Many customers wear their Mass & Slim Compression Leggings 8 to 12 hours daily, including during workouts. Tourmaline beads are embedded directly into the fabric. As you walk, move, or exercise, the beads create a gentle micro-massage effect against the skin that helps support healthy circulation, lymphatic flow, reduced fluid retention, and the appearance of smoother skin over time. The shaping and sculpting 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. 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. Yes. These are some of our most loyal customers. The combination 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?
How do the Tourmaline beads work?
How soon will I see results?
What if they don't fit?
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 Compression Leggings part of their everyday routine. Sculpting compression, real circulation support, and a confident silhouette designed to be seen.
60-Day Money-Back Guarantee · Free Size Exchanges · Secure Checkout
Mass & Slim Complete Shapewear Bundle - 1 Shorts, 1 Leggings, 1 Waist Shaper
The Ultimate Anti-Cellulite Slimming Shapewear Collection
Unlock the complete TheBlackPurple experience with our Mass & Slim Complete Shapewear Bundle. This exclusive 3-pack includes one Mass & Slim Shorts, one Mass & Slim Leggings, and one Mass & Slim Waist Shaper. Save $40 and enjoy the benefits of our flagship products, designed to give you confidence, comfort, and a slimmer silhouette.
Why Choose the Mass & Slim Complete Shapewear Bundle?
Our bundle offers the perfect combination of our best-selling anti-cellulite shapewear, providing comprehensive support and slimming effects for your entire body. Ideal for anyone who wants to experience the full range of benefits our innovative shapewear has to offer.
Key Benefits:
- Comprehensive Coverage: Enjoy the benefits of slimming and toning from your waist to your thighs with this complete set.
- All-Day Comfort: Soft, breathable Bamboo Viscose fabric ensures maximum comfort and flexibility for everyday wear.
- 360° Firmness: Sculpt your thighs, tummy, and waist with a firm yet gentle embrace, perfect for wearing under any outfit.
- Workout Enhancer: Boost your exercise routine with complete freedom of movement, maximizing calorie burn and improving blood flow.
Revolutionary Fabric Technology:
Experience the TheBlackPurple difference with our innovative fabric, featuring tiny Tourmaline® ceramic beads that create a micro-massaging effect to stimulate blood flow. This technology helps reduce cellulite and promotes increased circulation for long-term benefits.
Included in the Bundle:
1. Mass & Slim Shorts:
-
Light as air, these shorts tame your tummy and sculpt your thighs with a 360° hug.
-
Eliminate inner thigh chafing and sweat, allowing you to move effortlessly in any outfit.
2. Mass & Slim Leggings:
- Perfect for running errands, workouts, or wearing under office attire, these leggings smooth out unwanted bumps and enhance your curves.
- The snug yet cozy fabric targets your stomach, thighs, and hips for an immediate slimming effect.
3. Mass & Slim Waist Shaper/Belt:
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Immediate Effect: The highly targeted corset effect redefines your figure instantly, making your belly and waist appear thinner.
-
Long-Term Benefits: Tourmaline beads increase local skin temperature and improve circulation, helping to irrigate fat cells and reduce the dimpled appearance of the skin.
-
Micro-Massaging: The beads exert a gentle massage, boosting blood and lymph circulation.
How It Works:
- Slimming Bamboo Viscose: The fabric’s snug fit targets key areas for an immediate slimming effect.
- Micro-Massaging Tourmaline® Beads: These beads work continuously to give your skin a gentle massage, enhancing the benefits of movement and exercise. Wear the Mass & Slim products for 30 days consecutively for 8 hours a day to see visible results in terms of losing inches and reducing cellulite, along with improved circulation.
Material Composition:
- 53% Polyamide
- 33% Polyester
- 14% Elastane
Care Instructions:
Machine washable and dryer safe. We recommend using a gentle cycle and low temperature for best results.
Ideal for Everyday Wear:
Perfect for wearing under your regular clothes, jeans, leggings, or dresses. Many of our customers, including new moms, nurses, and health practitioners, rely on Mass & Slim products for enhanced circulation and comfort during long shifts. Our innovative garments are meticulously crafted to aid in reducing cellulite and inches, making them ideal for managing lymphedema, lipedema, or the natural progression of aging combined with busy lifestyles.
Personalized Customer Service:
We are committed to providing a personalized customer service experience tailored to your unique needs. Whether you're a hardworking mom, a dedicated nurse, or a professional navigating the complexities of age and work commitments, we are here to guide and support you.
Exceptional Value:
With our 3-pack offer, you get extra pairs for in-between washes and benefit from a multipack discount. This is a great value for our clients who need comprehensive shapewear to maintain their routine without interruption.
Mass & Slim Shorts - 3-Pack
The Best-Selling Anti-Cellulite Shapewear
Step into complete confidence with our Mass & Slim Shorts 3-pack. Save $40 and enjoy the convenience of having extra pairs for those in-between wash days. An innovative combination of style, comfort, and technology comes together to give you a figure-flattering shape the moment you put on our anti-cellulite shapewear. And that’s just the beginning.
Why Choose Mass & Slim Shorts?
Our best-selling anti-cellulite shapewear shorts are designed to give you the slimming, toning, and reshaping effects you need to feel your best, no matter where your day takes you. From running errands to dancing the night away, these shorts provide the support and comfort your body deserves.
Key Benefits:
- All-Day Comfort: Light as air, the Bamboo Viscose fabric feels like a soothing second skin, taming your tummy and providing all-day comfort.
- 360° Firmness: Sculpt your thighs with a firm yet gentle hug, perfect for wearing under your favorite jeans or dresses.
- Chafe-Free Confidence: Eliminate inner thigh chafing and sweat, allowing you to move effortlessly and confidently in any outfit.
- Ultimate Versatility: Whether you're headed to the grocery store, brunch, or lounging at home, these shorts offer the perfect balance of style and functionality.
Revolutionary Fabric Technology:
Experience the TheBlackPurple difference with our innovative fabric, featuring tiny Tourmaline® ceramic beads that create a micro-massaging effect to stimulate blood flow. This technology helps reduce cellulite and promotes increased circulation for long-term benefits.
How It Works:
- Slimming Bamboo Viscose: The snug yet cozy fabric targets your stomach, thighs, and hips for an immediate slimming effect.
- Micro-Massaging Tourmaline® Beads: Strategically placed beads work continuously to give your skin a gentle massage, enhancing the benefits of movement and exercise. This helps burn more calories, reduce cellulite, and improve circulation over time.
- Clinically Tested Results: Our shapewear is clinically tested to help reduce cellulite and inches over time. By wearing our Mass & Slim Shorts and leggings for 30 days consecutively for 8 hours a day, you will see visible results in terms of losing inches and reducing cellulite, along with improved circulation.
Material Composition:
- 53% Polyamide
- 33% Polyester
- 14% Elastane
Care Instructions:
Machine washable and dryer safe. We recommend using a gentle cycle and low temperature for best results.
Ideal for Everyday Wear:
Our shorts are perfect for wearing under your regular clothes, jeans, leggings, or dresses. Many of our customers, including new moms, nurses, and health practitioners, rely on Mass & Slim Shorts for enhanced circulation and comfort during long shifts. Our innovative garments are meticulously crafted to aid in reducing cellulite and inches, making them ideal for managing lymphedema, lipedema, or the natural progression of aging combined with busy lifestyles.
Personalized Customer Service:
We are committed to providing a personalized customer service experience tailored to your unique needs. Whether you're a hardworking mom, a dedicated nurse, or a professional navigating the complexities of age and work commitments, we are here to guide and support you.
Exceptional Value:
With our 3-pack offer, you get extra pairs for in-between washes and benefit from a multipack discount. This is a great value for our clients who need additional shorts to maintain their routine without interruption.
Mass & Slim Leggings - 3-Pack Offer
The Ultimate Anti-Cellulite Slimming Shapewear Leggings
Unlock the secret to a smoother, more confident you with our top-selling anti-cellulite shapewear leggings. For a limited time, buy our 3-pack of Mass & Slim Leggings and enjoy a $40 discount, giving you exceptional value and results.
Why Choose Mass & Slim Leggings?
Designed to feel like a second skin, these leggings are perfect for running errands, enhancing your workouts, or providing discreet support under your office attire or scrubs. Smooth out bumps, enhance your curves, and define your legs, thighs, and hips effortlessly.
Key Benefits:
- All-Day Comfort: Crafted from soft, breathable Bamboo Viscose fabric, ensuring ultimate comfort and flexibility for everyday wear.
- 360° Firmness: Tone your thighs with a firm yet gentle embrace, ideal for wearing under your favorite jeans.
- Workout Enhancer: Boost your exercise routine with complete freedom of movement, maximizing calorie burn and improving blood flow.
- Sculpt and Shape: Contour and highlight your legs, hips, and bum, boosting your confidence wherever you go.
Revolutionary Fabric Technology:
Experience the TheBlackPurple difference with our innovative fabric, featuring tiny Tourmaline® ceramic beads. These beads create a micro-massaging effect that stimulates blood flow, helping to reduce cellulite and promote increased circulation for long-term benefits.
How It Works:
- Slimming Bamboo Viscose: Our snug yet cozy fabric targets your stomach, thighs, and hips for an immediate slimming effect.
- Micro-Massaging Tourmaline® Beads: Strategically placed beads work continuously to give your skin a gentle massage, enhancing the benefits of movement and exercise. This helps burn more calories, reduce cellulite, and improve circulation over time.
Ideal for Everyday Wear:
Our leggings are perfect for wearing under your regular clothes, jeans, leggings, or scrubs. Many of our customers, including nurses and health practitioners, love wearing them under their scrubs for added comfort and support throughout their busy days.
Tailored for Your Needs:
We understand the unique challenges you face, whether it's lymphedema, lipedema, or the natural progression of aging combined with work and life commitments. Our focus is on providing personalized customer service to meet your individual needs. Whether you’re a hardworking mom, nurse, professional, or anyone navigating the complexities of age and work commitments, we’re here to support you.
Material Composition:
- 53% Polyamide
- 33% Polyester
- 14% Elastane
Care Instructions:
Machine washable and dryer safe. We recommend using a gentle cycle and low temperature for best results.
Experience the TheBlackPurple Difference:
Slip into a pair of our anti-cellulite leggings and feel the difference. With the added benefit of saving $40 on a 3-pack, you can enjoy the best in comfort, style, and slimming technology every day. Stock up with our 3-pack offer and ensure you always have a pair ready for in-between washes.
