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Why Wear an Undershirt?

Stops sweat stains, thanks to moisture-wicking underarm shields

Protects your clothes and saves money on dry-cleaning

Ultimate base layer, perfect for layering

Keeps you dry & cool all day long

Ultimate comfort, made with ultra-soft 4-way stretch fabric

Shop by Style

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The Crop 

Perfect for reducing bulk around your mid-section, especially when wearing high-waisted bottoms.

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The Square Neck

Designed with cap sleeves to seamlessly layer under all your shorter sleeved blouses. Features a flattering square neckline.

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The Three Quarter 

Classic fit with sleeves hitting just below the elbow. It features a reversible neckline for added versatility.

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The Signature

Our #1 best seller is the ultimate base-layer for every outfit. No more sweat-stains or deodorant marks.

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We've got an undershirt style for every outfit

Find Your Favorite Fits

Varied Top Lengths | Range of Necklines | Different Sleeve Lengths & Finishes I All Sweat-Proof

STOPS SWEAT STAINS

ABSORBS MOISTURE & ODOR

LIGHTWEIGHT & BREATHABLE

4-WAY STRETCH

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FITS TRUE TO SIZE

1000+ 5 Star Reviews

Our essential undershirts keep you cool & dry all-day long so sweat stains are no longer an issue

Jill M:

"I am blown away! Such an amazing product. I ordered one then immediately ordered two more. Exceptional."

Leslie B:

"Bought this to wear under sweaters and it is perfect! Soft, stretchy and comfy. I’ll be buying more."

Sara N:

"I can't believe I didn't buy these sooner. I sweat a lot and had just accepted sweat stains as a part of my life."

Katrina B:

"I love my Numi undershirts. I wear them pretty much daily under sweaters or blouses and I never have to worry about underarm stains."

The Wardrobe Essential You Didn't Know You Needed.

Imagine the confidence you’ll feel knowing that you’ll never have to worry about sweat & deodorant stains ever again.

As Seen On

Pair Undershirts & Silks Blouses

Pair sweat-proof undershirts with stain-repellent Sustainable Silk™ blouses.

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The Florence

Our fave grab-and-go style; throw on with jeans or tuck in to pencil skirt and head out the door.

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The Square Neck Undershirt

Designed with cap sleeves to seamlessly layer under all your shorter sleeved blouses without peaking out.

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The Simone

Our take on the classic silk button-up. Wear it every day without a worry; it's stain-resistant against water-based liquids & machine washable.

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The Signature Undershirt 

The ultimate base-layer for every outfit. No more sweat-stains or deodorant marks – stay fresh and feel clean all day with this game-changer.

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Sweat-Proof Undershirts: Your Questions, Answered.

Sweat proof undershirts are made of contemporary cotton with a unique underarm garment to prevent sweat stains from showing on the outer clothes. Our undershirts are made with moisture-wicking fabric that absorbs sweat and keeps you feeling dry and comfortable.

Make sure to check our sizing guide on the product page, next to the sizing choices. You can also take our sizing quiz to find the right size for you. If you’re still unsure, chat with us (pressing a chat box on the bottom left part) or send us an email at customercare@wearnumi.com

Our undershirts are machine wash cold, tumble dry low. Please wash with like colors.