4.7 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
4.7 Based on 640 Reviews
5 ★
82% 
526
4 ★
11% 
70
3 ★
3% 
21
2 ★
1% 
5
1 ★
3% 
18
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Filter Reviews:
JB
12/20/2025
joseph b.
US US

V-neck and crew-neck undershirts

Absolutely fantastic. The light-weight, very thin material in some magic way keeps me feeling pleasantly cool but also just warm enough for the winter weather up north here with my grandchildren. I'll be buying more of these and similar products.

SB
12/20/2025
Sean B.
US US

Good customer service

Very good. I ordered the V neck by mistake UnderFit let me return them for crew neck

TJ
12/19/2025
Ted J.
US US

Great Undershirts

Wow! I couldn’t believe how soft these shirts were right out of the package! They fit great; nice and snug just like I like them. I miss the old Ribbed Undershirts but these are equally as nice and comfortable. Also very prompt shipping. I will likely be ordering again. A+. Thank you.

MW
12/18/2025
MARY W.
US US

Husband loves!!

The customer service and leadership of this company are topnotch! My husband loves these shirts and asked me to get several more.

AJ
12/16/2025
Allan J.
NZ NZ

Fits Perfectly

My shoulder width is 45cm (17.7") and the small sized undershirt fit me perfectly. It is quite long, ensuring it won't get untucked. I had a small problem with customs but the customer service handled it efficiently. I would recommend choosing the smaller size if you're in between sizes. I regret choosing a medium. The undershirt feels very cool to the skin and the fabric seems very moisture wicking.

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.

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