Build Your Own Undershirt Pack - Buy 5, Save $35
Our invisible deep v-neck undershirt disappears beneath your thinnest or light-colored dress shirts and outer layers. The light, breathable TENCEL™ fabric absorbs sweat, prevents odors and keeps you cool.
We back all of our undershirts with a 100-day guarantee. We’re so confident in them that in the unlikely event that the collar ‘bacon necks’ or a seam breaks, don’t sweat it! We’ll gladly replace it with a new one.
No creases. No V-neck outline. Just seamless, invisible comfort.
With a white undershirt, you can see the v neck and sleeves under many light colored dress shirts.
With an UnderFit tone undershirt, the undershirt disappears. Our tone color works for both light and dark skin.
UnderFit undershirts are just in a different universe compared to what you’re used to. We took everything we hated about basic undershirts – the baggy fit, the stagnant, non-stretchy materials, the static cling, the way they soak when you sweat – and made a product that solves for every single one of our complaints.
We believe men deserve better than what they’ve been given for decades, and finally perfected an undershirt that:
Men have been working with what they’ve been given, but what they’ve been given is a bad undershirt experience. We know confidence starts underneath, and we’re ready to re-introduce you to comfort.
To look your best, you have to feel your best. You don’t need a rock-solid physique to rock the invisible undershirt. Our shirts work for guys of all shapes and sizes.
Here’s what our customers told us they love about UnderFit:
Our undershirts are made from TENCEL™ fabric blend, a highly-sustainable textile sourced from wood chips. The trees are sustainably farmed and our manufacturing process is “closed-loop,” meaning there is little to no waste.
While we’re proud of making a sustainable product, we’re even more proud of just how ridiculously comfortable these undershirts are. You’ll never want to take it off. Seriously.
Menswear experts universally praise the Invisible Undershirt
Gotta tell you, it’s a very nice product. Good fit, good feel, good price. Comparatively, the UnderFit fits and feels very close (or as nice as) to the more expensive micromodal/lycra undershirts.
No rising, No billowing. We managed to get through a whole day without a single untuck from under our made-to-measure shirts.
The problem with most undershirts is that they’re just T-shirts. UnderFit’s shirts are made from lightweight yet durable fabrics with a touch of stretch and are designed to be worn under your shirts.
All of our undershirts are backed by a 100-day guarantee. Don’t love it? Contact us and we’ll make it right.
Free Returns & Exchanges
If we haven’t answered your questions here, hit our chat or email us at [email protected]
These are the most comfortable and best fitting undershirts I’ve ever purchased. They do what an undershirt is supposed to do without adding any bulk. The tailored, close fit actually feels good against your skin. I really don’t even know I’m wearing them.
I have worn UnderFit undershirts for several years (since 2019 I believe) and have been super satisfied. The fit (according to the chart on website) is spot on. It snugs up to the torso and arms like a second skin. I get a v-neck because I love wearing crisp long sleeve shirts for business and casual wear.
Respectful and honorable dealings.
Die hard cotton loving husband converted by this shirt. Snug fit, so do purchase one size up from your usual. It’s worth it to get the shirt.
So comfortable to wear under a dress shirt. Keeps you cool and you barely feel that you are wearing an undershirt.