Michael C.
Worth every penny.
These shirts come as advertised. Simple, soft, don't come untucked, and don't mess up the silhouette of your dress shirt. They are the unseen, unsung heroes of a truly smart look.

UnderFit undershirts are cut longer and lightly hug your hips and below, to stay tucked in all day. Our fabric is ideal for undershirts due to its exceptional softness, advanced moisture absorption, odor resistance and superb breathability. If you want to remain less comfortable in your run-of-the-mill undershirt, by all means, DON’T buy an UnderFit.
UnderFit (underfit.com) has 365 customer reviews on Five Star Index, with an average rating of 4.5 out of 5.
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Michael C.
These shirts come as advertised. Simple, soft, don't come untucked, and don't mess up the silhouette of your dress shirt. They are the unseen, unsung heroes of a truly smart look.
Matthew
UnderFit has changed the under shirt game for me. It fulfills everything I want from undershirts: -comfy: soft and tagless (I am picky about this one---I hate stiff/rough shirts) -fitted (5'8", 150 lbs, M fits a bit big at first but after a wash it's perfect) -long enough to tuck---no more having to continually re-tuck -v-neck deep enough to unbutton 2 buttons, which is the most you'd want to unbutton under normal circumstances Thanks UnderFit!
Ryan B.
I previously had Hanes v-neck undershirts that were loose fitting around the waist even though I bought a smaller size, and they would untuck themselves throughout the day, making me look like I gained 10 pounds every time I walked by a mirror. I did a TON of research to find tight-fitting undershirts that hug the body all the way down. These do the trick. I first ordered a large (my standard shirt size) as well as a medium to test them out; both are v-necks because I wanted to be able to unbutton the top 2 buttons without the undershirt being seen. Both sizes fit just fine, but the medium worked perfectly for me. The medium stretches the v-scoop wider and lower since it is a size smaller than my usual. The material is EXTREMELY stretchy, soft and thin enough to even wear under a tight t-shirt; truly like a second-skin. It also extends well below the belt line (down to mid-butt & pelvic areas) to stay tucked in all day. These shirts are awesome so I bought 4 more mediums to cover my workweek. If you have the same need I do to have an undershirt(s) that hugs the body all the way down, has a v-neck deep & wide enough to stay hidden with 2 undone buttons, and is super-comfy, get these; but I recommend getting one size smaller than your usual to accomplish the afore-mentioned “needs” that I had. Worth every penny, and definitely worthy of my taking the time to write this review. Hope it helps someone.
DMG
Had been looking for a high-quality, mid-price undershirt that was slimming, cooler, and prevented sweat from reaching my outer layer. These fit the bill.
Andy C.
Love the tight fit, especially under dress shirts. Will definitely purchase again.
Brian H.
My wife bought me 4 of these for Christmas. I'm a cheapskate so I thought she was crazy to spend $100 on t-shirts. After wearing them for less than a week, I bought 4 more myself and literally threw away all of my other t-shirts. I have an athletic build and prefer a snug fit but to get it I've had to purchase a smaller size to get a shirt to fit right. Unfortunately, that means the shirts end up being too short after a couple of wash/dry cycles and get tight in the armpit area. Purchasing the "right size" always meant a boxy shaped shirt. UnderFit shirts are longer, fit like a snug glove and the material is "stretchy" so no bunching up under the pits. I've put then through a dozen wash/dry cycles and the color is still perfectly white - even under the arms. I'll probably never wear a different brand as long as I can purchase these. I would recommend them to anyone.
JR
Love how it fits close to body, no bulk. Prompt delivery, excellent service. good quality product.
Dan P.
THE best customer service that I've ever had with ANY company. Returned larges that didn't fit even though I had worn one no questions asked and no shipping charges!!! Emails at 9 at night. The shirts fit great and don't ride up. Excellent for warm weather.