THE SIGNATURE UNDERSHIRT

Stop 100% of Sweat Stains with Numi's Patented Technology

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

The Signature Undershirt
The Signature Undershirt
The Signature Undershirt
The Signature Undershirt
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The Signature Undershirt
The Signature Undershirt
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#1 Best Seller

The Signature Undershirt

$65

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.

*Based on moderate to heavy sweaters

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

As Featured In

No Sweat Stains? How?

Secret Sweat Shields

Our undershirts have a discreet sweat shield in the underarm made from special sweat absorbing technical fabric. This innovative feature offers added sweat protection and keeps your clothes clean longer.

TENCEL™

Remove sweat before it happens! TENCEL™ is a sumptuously soft, breathable fabric that regulates your body temperature, making it the perfect layering piece.

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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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

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.

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

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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