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The Invisible Undershirt


Our invisible deep v-neck undershirt disappears beneath your thinnest or light-colored dress shirts and outer layers. The light, breathable TENCEL™ fabric absorbs sweat, prevents odors and keeps you cool.

Size & Fit Guide
3 shirt
Save 15%
5 shirt
workweek pack
Save 25%
10 shirt
stockpile pack
Save 30%
Free shipping on orders over $75. Free returns.


We back all of our undershirts with a 100-day guarantee. We’re so confident in them that in the unlikely event that the collar ‘bacon necks’ or a seam breaks, don’t sweat it! We’ll gladly replace it with a new one.


Tailored Fit &
Stays Tucked
Incredibly Soft
Won’t Pill
Fights Odor
All Day

The Invisible Undershirt Stays Hidden

No creases. No V-neck outline. Just seamless, invisible comfort.

With a white undershirt, you can see the v neck and sleeves under many light colored dress shirts.

An UnderFit undershirt stays hidden

With an UnderFit tone undershirt, the undershirt disappears. Our tone color works for both light and dark skin.

The Fit

Learn To Love Your Undershirts Again

UnderFit undershirts are just in a different universe compared to what you’re used to. We took everything we hated about basic undershirts – the baggy fit, the stagnant, non-stretchy materials, the static cling, the way they soak when you sweat – and made a product that solves for every single one of our complaints.

We believe men deserve better than what they’ve been given for decades, and finally perfected an undershirt that:

  • Works for the office, a night out, or around the house.
  • Features the highest-quality, comfortable fabrics.
  • Stays tucked in all day long (with no “undershirt gut”).
  • Offers anti-odor and advanced moisture absorption.

Find Confidence You Didn’t Know You Had

Men have been working with what they’ve been given, but what they’ve been given is a bad undershirt experience. We know confidence starts underneath, and we’re ready to re-introduce you to comfort.

To look your best, you have to feel your best. You don’t need a rock-solid physique to rock the invisible undershirt. Our shirts work for guys of all shapes and sizes.

Here’s what our customers told us they love about UnderFit:

  • Look slimmer and feel more confident.
  • Stays tucked all day, no matter how you move.
  • Moisture wicking & odor resistant fabric keeps you feeling fresh.
  • Tailored fit hugs your biceps and waistline to eliminate lines and “t-shirt bulk” around your middle.

Pillowy Soft & Sustainably-Made

Our undershirts are made from TENCEL™ fabric blend, a highly-sustainable textile sourced from wood chips. The trees are sustainably farmed and our manufacturing process is “closed-loop,” meaning there is little to no waste.

While we’re proud of making a sustainable product, we’re even more proud of just how ridiculously comfortable these undershirts are. You’ll never want to take it off. Seriously.

  • All-day breathability. Soft, light, and flexible.
  • Excellent durablility. No pilling after extended wear.
  • Wicks 50% more moisture than cotton.
  • 1/20th the environmental impact of cotton.

You’re A Reviews Person? We Got The Receipts

Menswear experts universally praise the Invisible Undershirt

Gotta tell you, it’s a very nice product. Good fit, good feel, good price. Comparatively, the UnderFit fits and feels very close (or as nice as) to the more expensive micromodal/lycra undershirts.

The Undershirt Guy

No rising, No billowing. We managed to get through a whole day without a single untuck from under our made-to-measure shirts.

The Gents Staff
Gents Among Men

The problem with most undershirts is that they’re just T-shirts. UnderFit’s shirts are made from lightweight yet durable fabrics with a touch of stretch and are designed to be worn under your shirts.

Valet Staff
Valet Mag

A Perfect Fit. Guaranteed

All of our undershirts are backed by a 100-day guarantee. Don’t love it? Contact us and we’ll make it right.

  • 20k+

    Happy Customers

  • 140k+

    Undershirts Sold

  • 100%

    Free Returns & Exchanges

Frequently Asked Questions

If we haven’t answered your questions here, hit our chat or email us at [email protected]

TENCEL™ Fabric Feel

What makes it an invisible undershirt? Why is it beige?

Why do we use our TENCEL™ blend and not cotton?

Why do UnderFit undershirts cost more than cotton basics?

How do UnderFit undershirts stay tucked all day long?

What is the right fabric (moisture absorbing vs wicking) to wear?

What’s wrong with viscose, bamboo, organic cotton or other fabrics?

Where are the shirts made?

Finding The Right Fit

How does it fit?

Will it tighten to pull my belly in?

Will it feel tight?

Customer Service Questions

What if I try UnderFit and don’t like it?

What is your returns policy?

Do you ship worldwide?

Customer Reviews
4.8 Based on 438 Reviews
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Filter Reviews:
Joseph S.

Quality Undershirt

The item exceeded my expectations in all honesty. I was very on the fence due to the very high price to be paid for an undershirt but the fit was very good! It fits like an athletic t-shirt and does a great job of absorbing sweat and natural musk that radiates from your body throughout the day. The deep V-neck is perfect for wearing under a dress shirt when you want to keep your dress shirt unbuttoned. It was so good I bought more!

Adam B.


I love the beige underfit shirts! Best part is how invisible they are underneath white shirts. Also the length on them is perfect to stay tucked in if needed. I got 7 and wear them everyday now.

George S.

I’m hooked

Very comfortable; stays hidden under my white dress shirts; love how it stays tucked in all day

Jason H.

Almost perfect

I really like the tight fit and long length. The tight fit & long length prevents creating bagginess when worn under a dress shirt. My only minor quibble is that I wish there was an option with a higher collar that is closer to traditional v necks; the very low collar does not hold men’s chains and prevent them from sliding out (which creates an unprofessional look). I wear a religious item on a chain under my shirt but it slides out if I bend over slightly. This issue doesn’t occur with traditional vnecks. Very minor and doesn’t stop me from otherwise really liking these shirts.

Aaron S.

Unfortunate Customer Service

The shirts themselves were of the quality I expected, having ordered from UnderFit before. The problem arose when I received my order, and it was short one of the shirts (only 19 of the 20 I ordered). I used the online customer contact form (the only option to contact customer support), but received no response. I waited a few days and submitted another contact form to customer support...but still received no response. At this point it was one week after initially contacting customer support with no response. I then used the email address included in the review request email, but received no response there. I went so far as to messaging the company through their Facebook page, but again, received no response. So, I only have 19 of the 20 shirts that I paid for, and absolutely no response from the company to my requests for customer support to get the last shirt that I paid for.