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Men's Sweat Proof Undershirt - Slim Fit Crewneck

Thompson Tee Guarantee Sweat Proof Guarantee

Men's Sweat Proof Undershirt - Slim Fit Crewneck

Thompson Tee Guarantee Sweat Proof Guarantee
$34.99

Free Domestic Shipping Over $50 Shipping Information

Dress with confidence in our Slim Fit Undershirt

Thompson Tee's men's slim fit undershirts feature patented sweat proof technology that stops sweat in its tracks! Our undershirts are 100% made in the USA and backed by our 30-day guarantee.

The Thompson Tee slim fit undershirt fits discreetly beneath your favorite button-down or t-shirt to protect your clothes from armpit sweat, stains and odor. Our men's slim fit undershirt comfortably hugs your body for a streamlined look and feel that's seamless under layers. Ease your worries and tackle any sweaty situation with confidence.

Patented Sweat Proof Technology for Slim Fit Crewneck Shirts

Patented, Sweat Proof Technology

Layered

Proprietary moisture-wicking design stops sweat from showing through your underarms — period.

Seam

Center seam with separate front and back sweat panels offers a sleek, tailored fit and feel.

Washing

Hydro Shield sweat proof technology won't wash out or lose effectiveness over time. Prevent pit stains day after day, wash after wash.

Slim Fit Crewneck Shirt Features
Feature 1

Ultra-Soft, Lightweight Material

Our men's slim fit undershirts contain 95% premium rayon from bamboo and 5% spandex for a smooth, body-hugging fit.

Feature 2

Tagless, lay flat collar

Itchy, scratchy tags are a thing of the past. Thompson Tee's tagless design ensures our shirts lay flat with no unsightly bunching.

Feature 3

Machine washer and dryer safe

Machine wash the slim fit undershirt in cold or warm water and dry on medium (or lower) heat.

Tuckable Slim Fit Crewneck TShirt

Long, Tuckable Length That Stays Put

Our slim fit undershirts have a long, tuckable length that stays in place, allowing you to move through your day freely.

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Thompson Tee Guarantee

The Original Sweat Proof Undershirt

We're serious when we say no more pit stains. We guarantee sweat won't penetrate the underarm barrier -- or your money back!

Thompson Tee Guarantee

Free Returns

Wear it, wash it and try it. We offer free returns on all opened or used shirts up to 30 days from purchase date.

Thompson Tee Guarantee

Made in USA

Every phase of production is completed in the USA - from materials to manufacturing. Each undershirt purchase supports U.S. jobs and manufacturing.

Thompson Tee Guarantee

Real Customer Service

No web bots here. We have a team of friendly people ready to answer all of your questions.

Size Chart


XS Chest 32 in / 82 cm
S Chest 34 - 36 in / 86 - 92 cm
M Chest 38 - 40 in / 97 - 102 cm
L Chest 42 - 44 in / 106 - 112 cm
XL Chest 46 - 48 in / 115 - 122 cm
2XL Chest 50 - 52 in / 127 - 132 cm
3XL Chest 54 - 56 in / 137 - 142 cm
XS S M L XL 2XL 3XL
Chest - inches 32 34 - 36 38 - 40 42 - 44 46 - 48 50 - 52 54 - 56
Chest - cm 82 86 - 92 97 - 102 106 - 112 115 - 122 127 - 132 137 - 142

Faqs about our tees

How is the Thompson Tee different from other "sweat proof" shirts?

The Thompson Tee is the original sweat proof undershirt.

It's the only undershirt backed by a patent from the U.S. Patent and Trademark Office for our Hydro-Shield sweat proof technology, which completely absorbs and blocks sweat while maintaining breathability. Although others might say "sweat proof," no undershirt can protect you like the proven Thompson Tee, and no other shirt has patented technology to back up such a claim.

Here are a few of the features that make our sweat proof undershirts unique:

  • Proprietary layering and stitching system blocks sweat from seeping through your underarms.
  • Sweat proof technology won’t wash out or lose effectiveness over time.
  • Separate front and back panels to trap sweat effectively, minimize heat build-up and keep you feeling cool.
  • The underarm barriers are created with a center seam design for a sleek, smooth fit that doesn’t bunch under your clothing.
Original Fit vs Slim Fit: Which one is right for me?

The shirt and size you choose will ultimately depend on your fit and style preferences.

Both our Men’s and Women’s Slim Fit shirts are made with rayon from bamboo and are intended to fit snug, so they’re more discreet underneath your clothing.

The Original Fit is made from 100% premium combed cotton and provides a little more breathing room for those who prefer a looser undershirt. If you're looking for the most sweat protection but like the fit of a typical T-shirt, you may want to try a size up in the Original Fit shirts.

Either way, both options come with our proprietary Hydro-Shield Sweat Proof Technology, backed by our Sweat Proof Guarantee!

For the complete guide to choosing the right Thompson Tee size and style for you, check out our blog here.

Is the underarm barrier really sweat proof?

YES - We didn't just call it "sweat proof." We earned it! The Thompson Tee is the only patented proprietary design that uses a clinical-grade sweat proof material that completely blocks moisture from passing through. Other shirts may advertise "sweat proof" but don’t hold moisture well. They typically consist of two cotton layers and are often treated with chemicals that could wash out over time. The benefits of our sweat proof technology are native properties, so the shirt will not lose its effectiveness over time. That's why every Thompson Tee with Hydro-Shield Sweat Proof Technology comes with a Sweat Proof Guarantee. We guarantee that your underarm sweat won’t penetrate the sweat proof barrier — or your money back!

How does the sweat proof underarm barrier compare to sweat pads?

While armpit pads and sweat shields may absorb some sweat, they do not allow moisture to evaporate. So throughout the day, armpit pads can lose their stickiness due to sweat or become heavy and bulky beneath your shirt.

Unlike sweat shields, garment guards and sweat pads, Thompson Tee's sweat proof barrier is the only patented sweat proof technology available. By trapping sweat and releasing it through evaporation, your sweat won't show through your outerwear. Plus, you won't have to worry about adjusting your sweat pad or changing it out for a new one throughout the day.

For more in-depth information on sweat pads and sweat shields, check out our page dedicated to the topic here.

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