Numi
Numi
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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

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Sweat

STOPS SWEAT STAINS

Sweat

ABSORBS MOISTURE & ODOR

Sweat

LIGHTWEIGHT & BREATHABLE

Sweat

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

Numi

Jill M:

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

Numi

Leslie B:

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

Numi

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."

Numi

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.

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As Seen On

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Shop Best Sellers

Bestseller
A person with long dark hair poses with one arm raised, wearing The Signature Undershirt by Numi in light beige, and looking off to the side. A woman with long dark hair stands facing forward, wearing a light beige short-sleeve top and light brown pants against a plain background. Her Signature Undershirt by Numi ensures she stays comfortable even in the heat, thanks to its sweat-proof design.
The Signature Undershirt
$70.00
Bestseller
A woman wearing Numi's sweat-proof light pink "The Crop Undershirt" and beige high-waisted pants stands against a plain white background. Rear view of a person with long dark hair wearing The Crop Undershirt by Numi in light pink, paired with beige leggings, standing against a plain background.
The Crop Undershirt
$65.00
NEW
"#color_Black|Azi is 5'9" and wears a size S "#color_Black|Azi is 5'9" and wears a size S
The AdapTex™ Tank
$65.00
Bestseller
"#color_BLUSH PINK|Jessica is 5'10", wearing a size S "#color_BLUSH PINK|Jessica is 5'10", wearing a size S
The Simone Button-Up Blouse
$220.00
Bestseller
"#color_TRUFFLE | Emi is 5'7.5" and wears a size S "#color_TRUFFLE | Emi is 5'7.5" and wears a size S
The Square Neck Cap Sleeve Undershirt
$70.00
Bestseller
A person with short dark hair and fair skin is wearing The Lace Undershirt by Numi, a white sweat-proof short-sleeve top, paired with beige pants, standing against a plain backdrop. A woman with short dark hair is standing with her back turned, wearing a white, sweat-proof undershirt called The Lace Undershirt from Numi and light brown shorts against a plain background.
The Lace Undershirt
$70.00
Bestseller
A person with long hair is wearing a white The Three Quarter Undershirt from Numi and beige pants, standing against a plain light background. A person with long hair is standing with their back to the camera, wearing a white Numi Three Quarter Undershirt and beige pants.
The Three Quarter Undershirt
$70.00
BestsellerSold out
"#color_WHITE|Jessica is 5'10", wearing a size S "#color_WHITE|Jessica is 5'10", wearing a size S
The Florence T-Shirt Blouse
$100.00

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.