4.8 Loved by 35,000+ Guys

Real Customers. Real Comfort.

The best undershirt is the one you forget you’re wearing. But don’t just take our word for it – see what the experts and our customers have to say.

I wear deep V undershirts most days with a few buttons undone. The beige is way less visible than my old white Tommy John. Size large fits perfectly.

Andy-D.-Review
Andy D.

Verified Buyer

I tried a wide range of brands before finding UnderFit. Now my drawer’s full of crew and v-necks I wear year-round. Comfortable in NYC’s freezing winters or sweltering summers. I won’t wear anything else.

James-B.C.-Review
James B.C.

Verified Buyer

I used to wear Thompson Tee, but UnderFit’s darker beige hides better under a white dress shirt. Wore it on my wedding day — looked great, felt great, and gave me the confidence to enjoy every moment.

Tristan-Z.-Review
Tristan Z.

Verified Buyer

Hands down, these are the best undershirts I have found. They are soft, comfortable, and most importantly they don’t show with my dress shirts.

Christopher-S.-Review
Christopher S.

Verified Buyer

Customer Reviews
4.8 Based on 782 Reviews
5 ★
84% 
660
4 ★
10% 
78
3 ★
4% 
29
2 ★
1% 
6
1 ★
1% 
9
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Filter Reviews:
JW
09/29/2026
Jake W.
US US

Beige Undershirt

Very nice undershirt. Mostly I visible under thin clothing even in sunlight. Very comfortable to wear in all temperatures. The only downside is they are on the more expensive side. They are actually more expensive than some of the shirts I put over top of them!

AZ
09/27/2026
Alex Z.
US US

crew neck undershirt.

excellent fit and material, great product.

CK
09/21/2026
Chip K.
US US

Very comfortable, wish neck was bigger

I like the undershirt quite a bit. But while I’ve worn all the v neck ones I bought, I haven’t gotten to wear the crew neck ones a full day yet because even the non v-neck shirts I’ve worn had a bigger neck opening than these crew neck undershirts, so I’ve worn others instead. Thanks!

BE
09/16/2026
Ben E.
US US

Shirts still missing from inventory

The shirts I ordered are mostly as expected, although the fabric content makes them just a little warm. I was hoping to replace my Tommy John t-shirts since they took the cheap route and changed their sizes. My problem with your company is that for many months you’ve not had black crew necks available in a few of the sizes…therefore, I’m looking for others. Thanks!

JY
09/14/2026
John Y.
US US

Wow

It was glorious !! I could have sworn I heard angels sing as the buttery soft material melted over my torso. I was skeptical before I put it on. I live in louisiana and where the summers are like walking through a steam sauna all day long. I am a funeral director and wear a suit all year long and it is brutally hot standing in the sun in cemeteries. Today, the first day I have worn your undercut shirt. Let me say that whole I probably lost 3 or 4 pounds of water weight . While it was brutally hot today, 97 with 78% humidity, it is truly horrific. However this shirt made it much more tolerable. I have worn undershirts since I was 16 years old and they all get soaked, heavy and uncomfortable. This shirt is a game changer!!! I will be ordering another bundle. The length was a nice change from the norm. Thank you for your innovative pursuit of the functional base layer of the suit. Cheers, Casey

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