
Stay Cool and Stylish with the lightest, most breathable drop we’ve ever made.
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The perfect balance of support, stretch, and softness.


Compact fit. Maximum comfort.

No seams, no bulk, no distractions — just pure comfort with or without outfit.
2 - 5 Business Days Worldwide Delivery
Seamless Lightweight Underwear
Ultra Soft Guaranteed Comfort
CS fabrics, a new kind of comfort.

CS Cotton
Made to be 2x Lighter and More breathable than your everyday cotton underwear.
With the right amount of stretch added to give you extra freedom and more durability.

CS Modal
Our ultra-soft modal Elastane blend, moves with you while maintaining its shape. It's naturally breathable, luxuriously smooth, and designed to feel like a second skin. Experience Unmatched levels of softness with our Modal Underwear.

CS Performance
We combined advanced synthetics with precision structure to deliver maximum breathability, stretch, and support in your underwear. With a micro-perforated surface and moisture-wicking properties, it keeps you cool and dry — even on the hottest days. Lightweight, fast-drying, and ultra-smooth, this is innovation designed to feel like nothing and function like everything.

Redefine Your Comfort
“Everything about cottosilk products is amazing. Fabrics, weight and comfiness, is unmatchable. I’ve ordered twice in the span of 5 weeks. LOVE IT!
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“very chic and very soft loved the logo color same like the underwear wow details really
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“Cottosilk's quality shines through. Worth every penny!
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“I've been wearing the Techno Flow Ice Trunk from CottoSilk for a week now, and I'm blown away by the comfort and performance! The fabric is so soft and breathable, and the fit is perfect. Highly recommend!" 5/5 stars
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“It’s the best long boxer I’ve ever worn. It’s great for all-day wear, whether it’s a long day or a short one. The length of it makes me feel like I’m not wearing anything at all.
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“Great fit, no slipping or bunching
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“They are very comfortable, stay perfectly in place, and truly remain invisible inside shoes. Soft, breathable, and discreet just what I was looking for! Highly recommended!
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All-day grip with no show.

Cool in every step, secure in every move — the socks you’ll forget are there.