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Men's Sweat Proof Undershirt - Slim Fit Crewneck

Men's Sweat Proof Undershirt - Slim Fit Crewneck

Sweat Proof Guarantee
Sweat Proof Guarantee

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


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


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


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
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?
Original Fit vs Slim Fit: Which one is right for me?
Is the underarm barrier really sweat proof?
How does the sweat proof underarm barrier compare to sweat pads?