Signature Undershirt 20% OFF

The Signature 
Sweat-Proof Undershirt

70% more

moisture-wicking

&

3x more

breathable than cotton

Stay cool, dry, and fresh all day with our innovative sweat-proof undershirts.

20% OFF

USE CODE NOSWEAT AT CHECKOUT

As Featured In

Sweat-Stains & Deo Disasters?

Wave them goodbye

The Signature Undershirt acts as a protective shield, preventing any unwanted stains from reaching your clothes. Our innovative fabric technology wicks away moisture, preserving your favorite outfits and extending their lifespan.

No Sweat Stains? How?

Secret Sweat Proof Shields

Our undershirts have a discreet and ultra-comfortable underarm sweat protection shield. Crafted from Contemporary Cotton™, a unique technical fabric that absorbs sweat and resists odors, our shields employ a one-way moisture transfer system, effectively redirecting moisture and sweat away from the body and keeping your clothing fresh for longer.

Thermo-Regulating. 4-Way Stretch.

Stay ahead of sweat with our advanced technology. Crafted from 90% Thermo-Regulating Tencel™, a supremely soft, breathable, and lightweight fabric that maintains your body temperature, ensuring you stay cool and dry throughout the day. The addition of 10% Lycra® offers optimal 4-way stretch and unmatched comfort for the ultimate layering essential.

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A Resounding Hit

I Love the fit and materials of my Numi classic shirt. It really protects the outerwear sweaters and jackets and other long sleeves from my sweat.. That says a lot.!!

Brooke L.

✓ Verified Purchase

I had a blouse that showed perspiration stains - it was frustrating to use adhesive pads. I am beyond happy with my signature undershirt. It is lightweight, comfy and works to prevent perspiration stains, just as advertised. Best part? Canadian company and made in Canada!

Alison T.

✓ Verified Purchase

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

Leslie B.

✓ Verified Purchase

Looking your best has never been easier

The Signature Undershirt is discreetly designed, ensuring no bulges or seams are visible under your clothing. You can confidently wear any outfit, knowing that your secret weapon is providing the perfect base-layer for a flawless appearance.

No Sweat Stains

Stay dry, confident, and stain-free with our unique cotton underarm shield. No more sweat stains, guaranteed.

Invisible Fit. 4-Way Stretch

Seamless sleeves and the ultra-soft four-way stretch fabric feels soft on the skin and works perfectly for layering

All Day Comfort

A long lasting & breathable fabric keeps you dry & cool all day long, no matter what life throws at you

The Signature Undershirt

Changed the Lives of Thousands of Women

Join the women who have already experienced the Numi difference. Embrace confidence, stay dry, and make a positive impact on the planet.

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#1 Best Seller

The Signature Undershirt

Use code: NOSWEAT for 20% off at checkout

$48.75

$52 ~~$65~~

Meet our #1 best seller, The Signature. This OG undershirt is 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. With 250,000+ sold worldwide, The Signature Undershirt is the real deal.

*Based on moderate to heavy sweaters

Color Size

Free Shipping on orders $150+
(After discounts, before shipping & taxes)

Elevate Your Outfit: Say Hello to the Better Base Layer

Meet our #1 best seller, The Signature. This OG undershirt is 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. With 10,000+ sold worldwide, The Signature Undershirt is the real deal.

Free shipping on U.S. and Canada orders over $150.

Please allow up to 2-3 business days for processing before your order ships. More shipping info here.

Returns

Sale Items:

For sale items with a 20% or more discount, you may exchange for another item or store credit. All items purchased from our Last Chance page or our Almost Perfect Sale, marked as “Final Sale” or promotional gifts are final sale, meaning that no returns, exchanges or refunds can be accommodated.

Tops, Dresses & Pants:

All are eligible for return or exchange within 30 days of delivery. Find out more about our return policy here.

We stand by the quality of our products. If you're not completely satisfied within 30 days of your purchase, contact us and we'll gladly refund your order. It's that simple.

Use our chat icon at the bottom left corner to chat with a live agent or send us an e-mail at customer@wearenumi.com

Feel your best in any situation

Say goodbye to embarrassing sweat stains and deodorant marks

As women, we understand the unspoken struggles of sweat-stains and deodorant marks, especially in social interactions. The signature undershirt, with its sweat-absorbing technology seamlessly integrated into the fabric, stands as your reliable ally against embarrassing stains and lasting comfort.

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