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Numi
Numi
"Amazing Invention, Absolutely Essential."

12 Reasons why Numi is the Ultimate Sweat-Proof Undershirt

Sweat Proof Underarm Shield Technology that Works

Say goodbye to embarrassing sweat stains with Numi's innovative underarm shields that effectively absorb moisture and prevent sweat from reaching your outer garments

Sweat, Moisture and Odor Control

Numi's shields wick away sweat and absorb moisture, keeping you dry and comfortable all day long, while the odor-resistant fabric ensures you stay fresh and confident.

Stain Protection for Clothes

Effortlessly maintain the appearance of your clothes with Numi undershirts, preventing deodorant marks and permanent sweat stains on your favorite garments.

All Day Comfort

Numi undershirts feature a breathable and lightweight fabric blend of 90% Thermo-Regulating Modal and 10% Lycra® for optimal comfort and flexibility, making them ideal for all-day wear. 4 way stretch makes it ultra comfortable.

Invisible Under Clothing for Easy Layering

Enjoy seamless, slim-fit designs that are virtually invisible under clothing for easy layering, allowing you to layer with ease and confidence. Whether you're wearing a blouse or a sweater, Numi undershirts provide a smooth and invisible base layer for a polished look.

This is NOT an Ordinary T-shirt:

Don't mistake it for an ordinary t-shirt—Numi undershirts are designed with advanced sweat-proof shields and materials to provide superior comfort and performance.

 Long-lasting Durability

Numi undershirts are shrink-resistant and fade-proof, ensuring they maintain their quality and appearance wash after wash. Our technology is embedded at the yarn stage, guaranteeing longevity and performance throughout the life of the garment.

More Confidence, Less Embarrassment

Experience all-day confidence with sweat and moisture under control, knowing that Numi undershirts provide reliable protection against sweat-related clothing issues. Enjoy peace of mind and less stress, allowing you to wear any color without fear of stains or embarrassment.

The Perfect Base Layer: 6 Styles, 7 Colors

Designed to be the ultimate base layer for any outfit, Numi undershirts offer both style and functionality. With six styles and seven colors to choose from, you can effortlessly elevate your wardrobe while staying protected and comfortable.Choose from a variety of styles to suit your wardrobe needs, from reversible necklines, cap sleeves to cropped lengths for a seamless look.

Save on Dry Cleaning Expenses & Time

Save money and time on dry cleaning by protecting your tops and blouses with Numi undershirts, allowing you to wear hard-to-care-for clothes collecting dust in your closet.  Bonus: Numi undershirts are easy to care for.

Risk-Free Trial with 30 Day Money Back Guarantee

Experience Numi's comfort risk-free with a 30-day guarantee, ensuring satisfaction or your money back.

Customer-Approved

With over 1000+ 5-star reviews, Numi undershirts are loved by satisfied customers worldwide for their exceptional quality and performance.

Customer Reviews

Definitely no sweat stains. Light as a feather feel, you'll forget you have it on.

Maria Y

Sweat-Proof Technology That Works

Use code: SWEAT20

Get 20% Off Your Purchase

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.
A person with long, dark hair is shown from the back wearing The Signature Undershirt in light pink and matching bottoms from Numi against a plain background.
A woman wearing The Signature Undershirt from Numi, a gray fitted t-shirt featuring a hip length, sweat-proof material, reversible neckline, short seamless sleeves with a raw edge, and a slim fit ideal for layering.
Image split in half: the left side features a close-up of The Signature Undershirt's beige sweat-proof underarm shield by Numi in action, while the right side shows a model wearing a beige top. Text highlights product benefits like effective sweat protection, exceptional comfort, and versatile heat-friendly layering options.
Close-up of The Signature Undershirt by Numi in beige, with text detailing features: sweat-proof, all-day comfort, lightweight, 4-way stretch, thermo-regulating material to manage heat, and a durable design to prevent shrinking and fading.
Comparison chart showing Numi's The Signature Undershirt vs. Other T-Shirts. The Signature Undershirt by Numi features built-in underarm shields to stop sweat stains and odors, provides comfortable invisible shields, has seamless sleeves, and is made from breathable fabric.
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.
A person with long, dark hair is shown from the back wearing The Signature Undershirt in light pink and matching bottoms from Numi against a plain background.
A woman wearing The Signature Undershirt from Numi, a gray fitted t-shirt featuring a hip length, sweat-proof material, reversible neckline, short seamless sleeves with a raw edge, and a slim fit ideal for layering.
Image split in half: the left side features a close-up of The Signature Undershirt's beige sweat-proof underarm shield by Numi in action, while the right side shows a model wearing a beige top. Text highlights product benefits like effective sweat protection, exceptional comfort, and versatile heat-friendly layering options.
Close-up of The Signature Undershirt by Numi in beige, with text detailing features: sweat-proof, all-day comfort, lightweight, 4-way stretch, thermo-regulating material to manage heat, and a durable design to prevent shrinking and fading.
Comparison chart showing Numi's The Signature Undershirt vs. Other T-Shirts. The Signature Undershirt by Numi features built-in underarm shields to stop sweat stains and odors, provides comfortable invisible shields, has seamless sleeves, and is made from breathable fabric.

#1 Best Seller

The Signature Undershirt

$70.00

Use code: NOSWEAT for 20% off at checkout

$52 $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 250,000+ sold worldwide, The Signature Undershirt is the real deal.

*Based on moderate to heavy sweaters

✓ Free Shipping on orders $150+
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STOPS SWEAT STAINS

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ABSORBS MOISTURE & ODOR

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LIGHTWEIGHT & BREATHABLE

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4-WAY STRETCH

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FITS TRUE TO SIZE