SUMMER CLEARANCE | LIMITED STOCK
Wear-resistant washing net
Wear-resistant washing net
+10,000 satisfied customers
Flatten Your Stomach Instantly
Smooth chest , invisible under a shirt
Naturally boosts weight loss
Hides love handles
After wearing it to the office for three weeks, my shirts finally hang straight. My stomach feels supported, and the tension in my lower back is gone. I don't even notice it anymore.
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Knit Zones Technology
- 30-day warranty
Free exchange
30-day risk-free trial
30-day risk-free trial
Try it with complete peace of mind. If you’re not fully satisfied, you have 30 days to return it to us and get a full refund. No stress—just the assurance of a purchase you can trust.
Materials & Care Instructions
Materials & Care Instructions
- Composition: 80% nylon, 20% spandex
- Washing: Machine wash on a cold cycle to preserve the compression
- Care: do not use bleach, do not iron, do not dry clean
They tested it
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You can't see anything under the shirt
My concern was that it would create a visible "shapewear" effect at the office. The result: none at all. I wear it under my fitted shirts, and no one has noticed a thing—except that I "look more put-together." Discreet and effective—exactly what I was looking for.
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I completely forget about it during the day
I was afraid it would be torture to wear for 8 hours. Actually, the fabric is really breathable—I sweat less than I do in a regular T-shirt. After 10 minutes, I don't even notice it anymore. I've already worn it 5 days in a row.
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Choose your usual size—don't go any smaller
A quick tip: Go by the size chart based on weight—it's accurate. I was torn between L and XL, so I followed the chart (XL), and it fits perfectly. A friend of mine went one size smaller, thinking it would be "tight," but he had to exchange it. Just follow the guidelines.
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The waist is fitted, and the shirt hangs straight
I'm skeptical by nature. But as soon as I put it on, it supports my stomach and my figure looks more defined under my clothes. It's not magic—it doesn't replace exercise—but the immediate effect is very real.
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It holds up very well in the wash
It's already been through about ten machine washes (at 30°, air-dried), and it hasn't changed a bit: it hasn't stretched out, the compression is still there, and the seams are holding up. For the price, I was expecting something worse—it's honestly a pleasant surprise.
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Even though it's sturdy, it gets the job done
I'm 1m80 and weigh 108 kg; I was sure it wouldn't fit. I went with a 4XL based on the size guide, and the fit is great—it doesn't cut off my circulation. It shapes my figure without being too tight. For once, a product is designed with people like me in mind.
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Easy to put on—not the struggle I was afraid of
I was familiar with compression garments, and it's often a struggle to put them on. This one slides on easily from top to bottom without any effort—the spandex really helps. No trouble at all, even when I'm rushing in the morning.
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Delivered in 3 days, and the money-back guarantee is reassuring
I rarely order this kind of product because I'm afraid of getting scammed. I placed the order on Monday and received it on Thursday; it was carefully packaged. The "money-back guarantee" was the deciding factor for me—but in the end, I didn't need it; I'm buying a second one.
Before and After FitSlim Power
Discover the difference: a visibly toned stomach, a reshaped figure, and invisible support under your clothes.
Seen on
Ionic Shaping Technology
How does it work?
Targeted compression
Calibrated compression zones wrap around the abdomen, sides, and lower back to keep the figure in place.
Breathable ionic mesh
A lightweight microfiber fabric that allows the skin to breathe and remains invisible under clothing.
Posture Effect
The back support encourages you to stand up straight from morning to night—no more slouching.
Because your figure deserves innovation.
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Others | |
|---|---|---|
| All-day compression | ||
| Invisible under the shirt | ||
| Breathable, sweat-wicking fabric | ||
| Effect on Posture / Back Alignment | ||
| 30-day warranty |
Frequently Asked Questions
Who is FitSlim Power intended for?
Who is FitSlim Power intended for?
For any man who wants to look slimmer, regain his confidence, improve his posture, and feel better in his clothes—without going to the gym.
How does that flatten your stomach?
How does that flatten your stomach?
The ionic fabric provides targeted compression that contours the abdomen and sides, helps maintain shape, and visibly slims the figure.
How long does it take to see results?
How long does it take to see results?
The visual effect is immediate as soon as you put it on. When worn daily, it helps improve your posture over time.
How do I choose my size?
How do I choose my size?
It mainly depends on your weight. If you're close to a size cutoff, go with the next size up.
What if the size doesn't fit?
What if the size doesn't fit?
Write to us, and we'll set up the exchange right away.
Machine washable?
Machine washable?
Yes — a gentle cold cycle to preserve compression.
FitSlim arrives in Paris – Come and experience it for yourself!
FitSlim is opening its very first pop-up store in Paris!
This is a unique opportunity to discover our products in person, try them out right there, and get personalized advice from our team.