About UnderFitDesigned for You. Perfected Over Years. Comfort Guaranteed.

Our Story

It all started in 2012 when three friends set out to solve a common problem: undershirts that just wouldn’t stay put. After two years of relentless testing and refining, they created a game-changing solution — an undershirt that actually works.

Word spread fast. Men who were tired of constant re-tucking and adjusting finally found relief. But it wasn’t just the longer cut that made UnderFit different—it was the premium fabric that delivered unmatched comfort and performance.

As a customer, I was so impressed that in 2019, I acquired the company. I wanted to ensure that UnderFit continued delivering on its promise: the perfect fit, premium materials, and the confidence that comes with all-day comfort.

Small Business, Big Standards

Every UnderFit product passes a simple test: Would I wear this myself?

We’re not here to maximize profits—we’re here to create products so good that customers become advocates. We source sustainable materials, partner with ethical manufacturers, and stand behind every shirt we sell.

When you reach out, you’re not dealing with a faceless corporation. My team and I personally oversee everything from product testing to customer service. That’s the UnderFit difference.

Built Around Your Needs

Our undershirts solve the problems other brands ignore through thoughtful design and premium materials.

Perfect Fit & Function

• Stays Tucked: Extra-long cut eliminates “undershirt gut.”
• No Bulk, No Bunching: Tailored fit creates a sleek silhouette under any shirt.
• Invisible Confidence: Deep V-necks stay hidden with open collars. Beige and gray disappear under light colors.

TENCEL™ Fabric Magic

• Twice as Soft as Cotton: Luxuriously smooth against your skin.
• Moisture-Wicking: Pulls sweat away before it reaches your dress shirt.
• Odor-Resistant: Antimicrobial properties keep you fresh all day.
• All-Season Comfort: Naturally cool in summer, warm in winter

What Our Customers Say

“You have an amazing product. I’ve been wearing them through several iterations. I’ve tried your competitors, so I want to tell you that UnderFit is my favorite of them all.” — Ian M.

“I’m suit-bound Monday through Friday and these shirts are the best. Worth the money for sure. Fit is on point. Love the extra length to keep tucked in and covered up if needed.” — Philip T.

“There is no other undershirt like this — nothing even close. Underfit shirts are actually LONG enough! And STRETCHY enough to move with you and stay tucked in and in place! UBER COMFORTABLE, they make you feel great! I rarely give reviews like this, but Underfit shirts are one of those rare products that truly enhance quality of life. You have to experience it to understand it. Highly, highly recommend!” — Billy M.