Nathan H.
As Advertised
I was looking for a slim shirt that a) didn't make my button look baggy/bulky and b) didn't keep coming untucked. This is the shirt. Slim cut and long and stays in place. Worth the price for a great fit!!

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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Nathan H.
I was looking for a slim shirt that a) didn't make my button look baggy/bulky and b) didn't keep coming untucked. This is the shirt. Slim cut and long and stays in place. Worth the price for a great fit!!
UnderFit Undershirts C.
These shirts were requested by our son on his Christmas list. He loves them!
Mike (Morristown, N.
I have been searching for the right undershirt for literally close to 20 years and I have never been happy. A few weeks ago I bought 4 of yours and immediately bought 4 more. They are AMAZING! I never write emails to companies but I felt I had to. I will never wear another undershirt. Thanks!
Kyle T.
The v is deep enough that the undershirt doesn't show until at least three buttons are undone, the fabric feels great, better than cotton. The fit is perfect in my normal shirt size - snug as an undershirt should be. The fabric also takes longer to smell than cotton when I've worn it a few days traveling.
Chris - Boston, M.
I needed to replace my cotton v-neck undershirts because they were visible when wearing dress shirts unbuttoned at the top (I hate that look), so I wanted a lower cut v-neck. I tried Tommy John and those did not work for two reasons: 1) they were expensive at about $40 per shirt, which is a lot when needing 6-8 shirts; 2) even more importantly, their fit was terrible -- the low cut was much lower than the pictures looked so when I put them on the shirts looked circus-like with them falling closer to mid-chest and the v of the v-neck appearing more like a semi-circle scoop. I felt ridiculous wearing them. I was one and done with TJ shirts. Then I found UnderFit. I bought a couple to try, which was low risk because they were about half the cost of TJ shirts, and found the UnderFit fit was PERFECT. The v-neck rides at just the right height so it's not visible with a couple of top buttons undone (not too low, not too high), they hug your skin so they don't add volume making it look like you're wearing an undershirt, they have some additional length so they stay perfectly tucked in, the fabric is super comfortable, and the price is right. After the first order I got an email from Paul Beck telling me to be in touch if I have any problems so they can monitor quality carefully and they'll replace anything if I find issues (young company that clearly cares about their products and customers). I quickly ordered more (both v-neck and crew) replacing all of my old t-shirts. I never write reviews but had to for this because I want this company and their shirts to stay around a long time -- I can't imagine finding anything better.
UnderFit Undershirts C.
The best part about these shirts is their absorption - never get pit stains w/ this shirt or feel wet even when the shirt itself is wet. Given that - they surprisingly do not stink like synthetics (worst) or cotton (ok), and are closer to wool and I've reworn them when in a pinch. The tuck-in and all the other features are great for their use as an undershirt and the shirts are close-fitting which may be new for some of us. They are very soft and good tactile feel. The modal materials from woods are also more sustainable than cotton and oil-based synthetics. Great product overall, highly recommend, and excellent customer service from Paul and their team.
Ian M.
I've had my shirts for about 6 months and love them. They feel very comfortable. They do stay tucked in all day which is nice and they let me more confidently wear various styles shirts to work knowing my undershirt is going to stay hidden and tucked in.
K Miller, Los A.
I tired of cotton years ago, and have tried all of the "best" synthetics (i.e. Under Armour, etc.). Underfit is by far the best shirt I've worn. The fit is great, the shirt stays in place, and it seems to wash well without fading or discoloration. The staff are also extremely friendly and accommodating - a perfect experience.