THE ULTIMATE UNDERSHIRT
Stop 100% of Sweat Stains with Numi's Patented Technology
Stay cool, dry, and fresh through every season with our innovative sweat-proof undershirts.
The Signature Undershirt
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.
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✓ 30-Day Money Back Guarantee
Size Guide
Fit Tips
Numi Essential Undershirts: Our undershirts are tightly fitted to the body, with some stretch to the fabric. If you fall between sizes on the chart, we recommend choosing the larger size as they are a snug fit.
Numi Sustainable Silk™: Our silks fit true to size. If you fall between two sizes on the chart, we recommend choosing the larger size for comfortability.
Functional Essentials for Effortless Layering
EMBARRASSING 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.
A Resounding Hit
Looking Your Best Has Never Been Easier
Numi Undershirts are 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 4-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 NUMI Undershirt
Changed the Lives of Thousands of Women
Join the community of women who have experienced the Numi difference, finding a dependable ally against embarrassing stains and lasting comfort.
THE ULTIMATE UNDERSHIRT
Stop 100% of Sweat Stains with Numi's Patented Technology
Stay cool, dry, and fresh through every season with our innovative sweat-proof undershirts.
20% OFF
Use code NOSWEAT at checkout
Functional Essentials for Effortless Layering
As Featured In
EMBARRASSING 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.
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.
BUY NOW
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
Numi Undershirts are 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 NUMI Undershirt
Changed the Lives of Thousands of Women
Join the community of women who have experienced the Numi difference, finding a dependable ally against embarrassing stains and lasting comfort.
BUY NOW
FAQs
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FAQs
Frequently Asked Questions
Why do I need an undershirt?
Undershirts are essential for women, providing a sweat-proof barrier to prevent visible sweat stains on outer clothing. Secondly, undershirts keep you dry and comfortable all day long, instilling the confidence in your wardrobe. They also extend the life of outerwear by reducing the need for frequent washing.
What makes Numi undershirts sweat-proof?
Our sweat-proof undershirts feature a Contemporary Cotton underarm shield, designed to wick and absorb moisture and prevent sweat stains from showing on your clothes. And by crafting the body of our undershirts from a TENCEL™ fabric to help regulate your body temperature, we guarantee all-day comfort.
How do I find the right size?
Find your perfect fit! Check our sizing guide on the product page, along with a handy sizing quiz to help you discover the right size for you. If you need personalized assistance, chat with us (bottom left corner) or email customercare@wearnumi.com.
How do I wear an undershirt?
Our undershirts are designed to be invisible under your clothes. They fit perfectly under your favourite blouses, sweaters and blazers to stop sweat stains and keep your clothes clean longer.
