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Undershirts
- White V-Neck
  
  Our most popular fit. Deep v-neck stays hidden throughout the day.
  
  White Crew Neck
  
  Timeless comfort. Perfect under anything from suits to casual shirts.
- Invisible V-Neck
  
  Ultra low-profile. Designed to stay hidden under light fabrics.
  
  Black V-Neck
  
  Understated and sharp. The go-to for darker layers.
- Gray V-Neck
  
  Sleek and modern. A fresh fit for any contemporary wardrobe.
  
  Gray Crew Neck
  
  Clean and versatile. A classic fit for any wardrobe.
Our Story
Our Fabrics
Reviews

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.

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.

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.

Verified Buyer

I’ve tried performance undershirts for 13 years and wasted plenty on ones I didn’t like. UnderFit is the first that truly works. Stays tucked, sleeves stay hidden, handles Arizona heat, and still looks new after a year of weekly wear. Worth it.

Ryan W.

Verified Buyer

Best undershirts I’ve ever tried (and I’ve tried a bunch). So comfortable I forget they’re there. And they never come untucked. And the sleeves are short enough they don’t peak out of my t-shirts.

Tim C.

Verified Buyer

I’ve been wearing these for years. They fit great. Comfortable. They don’t come untucked. They protect your shirts. They last a long time. Customer service is excellent too.

Aron Y.

Verified Buyer

I bought my first V-neck in 2016 and have ordered several more since. They’re incredibly comfortable, hold up to daily wear, and the fabric is perfect for Florida heat. Light but not flimsy. Fantastic product I wear daily.

James K.

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.

Verified Buyer

I love these shirts, I have 3 of them. They feel great, fit snug, stay hidden, and I wear them anytime I want to protect a shirt from deodorant or sweat stains. Essential if you want to keep your nice shirts looking new.

Aaron F.

Verified Buyer

Customer Reviews

4.7 Based on 710 Reviews

5 ★

84%

595

4 ★

10%

3 ★

2 ★

1 ★

Customer Photos

V-Neck Undershirt - White, Tall - Customer Photo From Jordan Doolittle

Crew-Neck Undershirt - White, X-Large - Customer Photo From joseph bucaro

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04/30/2026

Aaron A.

Fantastic

You can’t even feel your wearing anything. 10+ hours of wearing it feel great tucked in all day!

04/30/2026

Aaron A.

Fantastic

You can’t even feel your wearing anything. 10+ hours of wearing it feel great tucked in all day!

04/30/2026

Aaron A.

Fantastic

You can’t even feel your wearing anything. 10+ hours of wearing it feel great tucked in all day!

04/29/2026

Stacey H.

Great service and shirt.

I rarely leave reviews, but this company has some of the best customer service I’ve seen in a very long time. I had questions about sizing, and Leigh, the owner, personally thanked me for my purchase and answered all of my questions quickly and thoroughly.The product itself is amazing. The shirts are incredibly soft and long enough to actually stay tucked in all day. Ordering and working with the company was such a pleasant experience. My husband is looking forward to wearing these for our son’s wedding and being comfortable without the bulky feel of a regular undershirt.They are also one of the few companies that offers a true beige color, which is a must-have under white or light-colored shirts. No more silhouettes or lines showing through!I definitely recommend this company and will absolutely order again.

04/28/2026

James T.

I thought of it…why didn’t I act on it…?!

Everything I have been looking for in an undershirt! Fitted, very light material that doesn’t trap sweat. Perfect!

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

White V-Neck

White Crew Neck

Invisible V-Neck

Black V-Neck

Gray V-Neck

Gray Crew Neck

Real Customers. Real Comfort.

Andy D.

James B.C.

Tristan Z.

Ryan W.

Tim C.

Aron Y.

James K.

Christopher S.

Aaron F.

Fantastic

Fantastic

Fantastic

Great service and shirt.

I thought of it…why didn’t I act on it…?!

The Best Fit or Your Money Back

35k+ Guys Trust Underfit

175k+ Undershirts Sold

100% Hassle-Free Returns

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35k+

Guys Trust Underfit

175k+

Undershirts Sold

100%

Hassle-Free Returns