Premium Slim Fit Undershirts
Designed to contour perfectly to your body. These moisture-absorbing undershirts stay tucked in all day, ensuring you always look your best.
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Super Breathable -
Moisture Wicking -
Buttery Soft -
Stays Tucked All Day -
4-Way Stretch -
Fights Odor
Disappears under unbuttoned shirts for a clean, polished look.
A crisp, classic layer that works with every shirt.
Smooth and modern. Designed to layer under shirts.
Fades under dark clothing for a seamless appearance.
Blends under light shirts for a smooth, invisible foundation.
A staple layer made for dress shirts, sweaters, and beyond.
Neutral and modern. Built to anchor any outfit with ease.
Simple and sharp. A versatile pick for every wardrobe.
“Our #1 recommendation”
UnderFit combines comfort and performance for the ultimate undershirt experience.
Connor L.
Black Lapel Suits
“Simply the best undershirt, ever.”
Designed to stay hidden, keep you cool, and provide all-day comfort with a perfect fit that moves with you.
- Stays tucked all day
- Invisible under any shirt
- Tailored, sleek fit
- Ultra-soft & breathable
365-Day Feel Good Guarantee
These are the only undershirts I wear. Not just more comfortable. They make you look better too.
Nick E.
Verified Buyer
The Best Fit or Your Money Back
Every UnderFit undershirt comes with a 365-day risk-free trial. If it’s not the best undershirt you’ve ever worn, we’ll make it right — no questions asked.
35k+
Guys Trust Underfit
175k+
Undershirts Sold
100%
Hassle-Free Returns
The Best Men’s Undershirts – Uncompromising Quality
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Super-soft fabric
The secret to UnderFit’s superior comfort starts with the fabric. We use a TENCEL™ fabric blend that feels great against your skin, provides all-day comfort all day and is built to last.
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Lasting durability
What good is an undershirt if it tears or has holes after only a few uses? That’s why we use durable TENCEL™ fabric in our shirts. Unlike cotton, it has an exceptionally high tensile strength, making it harder to rip and tear. It also means your undershirt will continue to keep its great shape after repeated wear and washings.
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Greater breathability
In addition to the softness, UnderFit’s TENCEL™ fabric also offers superior breathability. This means that your undershirt will help you stay cool when things start heating up.
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Superb temperature regulation
Whether you’re at work or out on the town, you want to minimize heat as much as possible to avoid excessive sweating. Our TENCEL™ fabric blend helps to regulate temperature to let your body breathe when the heat goes up.
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Advanced moisture absorption
Just because you’re perspiring doesn’t mean others need to know about it. UnderFit offers the best undershirts for men who sweat, thanks to advanced moisture absorption that stops sweat in its tracks, so the rest of your clothes stay dry and fresh.
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Odor resistance
TENCEL™ fabric has moisture-wicking technology to limit moisture, keep you dry and prevent odor-causing bacteria. It’s just like the moisture wicking you expect from high-performance workout apparel, but designed for your day-to-day lifestyle instead.
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Eco-friendly & sustainable
We care about the environment just as much as we care about making the best mens undershirt! That’s why we only source our raw material from sustainably grown forest plantations.