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.
Written by the business, not verified by us.UnderFit (underfit.com) has a 4.3 out of 5 rating on OK.one, based on 101 user reviews collected here. It is listed under Shopping & Fashion and its reputation is good. 83% of reviews are 4 stars or higher and 14% are 1 star; The business has replied to 64% of negative reviews; Reviews mostly discuss Product, Quality, Customer service. Last updated 2026-09-05.
Reviewers overwhelmingly had a great experience with this company. Customers frequently praise the exceptional comfort and soft texture of the undershirts, noting they feel wonderful and fit perfectly when worn. Consumers also appreciate the high quality and durable material that holds up well over repeated washes without losing shape or performance. However, some people mentioned that certain items did not fit properly and required exchanges to get the right size. A few reviewers also noted occasional sizing challenges, pointing out that specific pieces felt too tight initially. Others experienced minor drawbacks regarding the fabric feel or material characteristics during warmer weather.
Auto-generated from all reviews of this business. For reference only.Easy to order, with great follow-up to ensure my satisfaction. The undershirts fit very well and are so comfortable that I barely notice I’m wearing one under my shirts. I’ve definitely found my go-to undershirt! I love doing business with small companies that go the extra mile to make sure their customers are completely satisfied. Highly recommend!
Fantastic undershirts. These have to be the softest and best fitting shirts thatI’ve ever found. The fit is perfect and they are extremely soft and comfortable. I will definitely be ordering again. A+. Thank you.
I've purchased twice from UnderFit. These are high quality t-shirts that don't add the bulk of a typical cotton T-shirt. They truly do not show through dress shirts and fit great. The ordering and shipping process was smooth and quick. Highly recommend!
Been wearing UnderFit shirts for over a decade (I am wearing one now) and over 150 pounds of weight loss. The smalls are a little tight (I'm 5'9 140 lbs) but the length remains spot on. The undershirts hold up well over repeated washes in cheap apartment washing machines/driers. What else can I say?
I have always purchased stretch fit undershirts from top name brands like Jockey and Alfani. I saw an ad for Underfit, and decided to try them. The fit was better and very light weight as well as cool. Have placed several order’s and will never change. I use them under a shirt, just with Jeans, as well as with my gym pants when I go to the gym. Worth the price.
As I lost more than 50 pounds, I needed to get V-neck t-shirts that were much smaller. I tried UnderFut and was pleasantly surprised. The real test of a shirt is: What do you reach for first? And I’ve been reaching for UnderFit every time.
Prompt fulfillment and a high quality product. I have had these undershirts for over a year and they are as good fitting as when they were new.
Fit advice by staff was amazing. Suggested a small, bought small and it fit brilliantly. It is completely invisible under my dress shirt even with two buttons unbuttoned. Not odor-resistant at all. I didn't even sweat and the smell from the armpit area even after wearing for only an hour was extremely noticeable. I don't like how it feels on the skin, feels too synthetic to me. However, it doesn't ever come untucked when I wear these undershirts which is a bonus and customer service sounds like human beings rather than AI.
They make the best undershirt I've ever worn.
Great shirt. Good service.
I ordered 2 UnderFit shirts, which feel quite soft and are comfortable to wear. However, I experienced immediate quality issues with a seam under the arm on 1 of 2 shirts separating after my first use. I contacted UnderFit for customer support and I initially received a response indicating they would help me with my quality concern, but then the communications abruptly stopped. Despite 3 attempts on my side to get help, UnderFit never again responded to me. Never before have I experienced that kind of disrespectful treatment from a brand claiming to offer a “premium” product (at a very high price point, as well). Overall, a very disappointing experience.
Not exactly what I was looking for I received two undershirts and after trying one on the fit was not right for me. This is always a risk with online purchases. I reached out to the return department and they make the process of return and refund simple.
I have been trying to return shirts from Christmas for 3 weeks with no response from the company. I have sent multiple messages per their website, and there are no phone numbers to call. Very frustrating!
Love these shirts! great fit, durable material, and as an undershirt help keep my other shirts in better shape. I have been wearing Underfit shirts for over 5 years now, and still a happy customer.
Great product, exactly as described on website.
In the beginning I didn't care for the first shirts I bought from Underfit . The more I wear them, the more I have grown to prefer them over cotton. Now they are pretty much all I wear as an under shirt. That drove my decision to purchase more in different styles and colors. I would recommend giving them a try if you are on the fence.
Customer service informed me of what size undershirt they recommended me to order. This gave me more confidence in buying their product. The undershirts did not clear customs in New Zealand and their delivery service said they were disposed of. I would recommend UnderFit's undershirts to be able to be cleared through customs automatically. UnderFit asked me to call the delivery service and the delivery service asked me to call UnderFit. Very confusing communication. Perhaps, a different delivery service may be better. However, the website is easy to navigate and the buying process is quick and easy; the discounts automatically applied without needing to enter a coupon code. All in all, ok customer service. Delivery service used could have been improved. However, website experience is easy to navigate. Edit: Undershirts arrived without me needing to do anything thanks to UnderFit customer service. Undershirts feel very cool to the skin. The Size S Undershirt fit me well, as recommended by customer service. The undershirts are very long, covering my buttocks. It does feel a bit hot wearing it under a dress shirt in Summer. However, they are easy to put on and off thanks to the 5% Spandex.
Hi Allan, I apologize for the frustrating experience here. We regularly ship internationally, all around the world, and this is the first time I've seen an issue like this from UPS. And our automated email notification was clearly NOT helpful. Would I be able to issue you a refund for the inconvenience + reship either way, free of charge, after resolving the customs issue?
The UnderFit Undershits I purchased are everything I had hoped for: a perfect fit and exceptional quality. They are worth every penny. And my experience with the customer service was second to none!
The size of the undershirts are perfect, they are very soft and comfortable to wear! Leigh was quick and helpful in responding to my e-mail and shipping was very fast.
My Canadian order was shipped to someone in California. I have sent an email to customer service & the owner Leigh McKenzie over 3 days ago and have yet to hear from anyone at Underfit. Their customer service is non existent!
Hi, thanks for calling this out. I should have responded faster, and that’s on me. UPS had a tracking glitch that marked some packages “delivered” when they hit a transit facility in Torrance, CA, even though they were still in transit. Your order is either already delivered or still on the way. If it’s still en route, I can share the final-mile tracking link with the latest updates. I’m here now and won’t leave you hanging.
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