Trusted by 165,000+ women
The invisible layer you wear under everything you love.
Protects your favourite sweaters, silks, and blouses — invisibly, all day.
Code NOSWEAT applies automatically at checkout. First-order offer. One use per customer.
"A nice discreet undershirt for cashmere sweaters and expensive blouses that gives you a bit of protection and confidence.""
— Cathy G.
"I'm an attorney who sweats in court everyday! Thanks to this undershirt, I am finally able to wear my work tops without any sweat marks. I'm keeping my suits clean with no stains and saving a ton on dry cleaning."
— Aubrey R.
"I couldn't be happier with my Numi shirt. It's smooth, it's comfortable, and it WORKS! I feel so much better about wearing my silk blouses and cashmere sweaters knowing they're not going to get stained under the arms."
— Jessica R.
"I love the thin layer and protection it provides under my cashmere sweaters and silk blouses. I don't have to dry clean my clothes as often!"
— Kareth M.
"Thanks to these undershirts my silk button downs and fancy blouses look brand new. Most of my tops need to be professionally dry cleaned so these undershirts also save me a lot of money. Numi is a god send."
— Mishele B.
"I purchased this to wear under silk blouses and cashmere sweaters to extend their life and decrease my washing/dry cleaning. Will be purchasing several more!!"
— Stephanie T.
"Not since I was a sweaty pre-teen in the 1980s have I been able to find an undergarment to protect my silks and cashmeres. Until now! The tee is discreet, comfortable, and light."
— Sandra W.
"These tops have given back my wardrobe and my confidence. I stopped wearing all my silk, sweaters, dresses, fitted knits — anything nice stayed in the closet. Not anymore."
— Angela G.
You love your clothes. Here's how to keep them.
Cashmere & knitwear
Wear it more. Wash it less. The shield stops sweat before it stains.
Silk & blouses
Deodorant marks stay off your best tops.
Blazers & suiting
Dry-clean less. Your wardrobe lasts longer. You spend less replacing it.
Most women start with The Signature.
The Signature Undershirt
Invisible under everything. Built for V-necks, crew necks, and everything in between.
OVER 400,000+ SOLD WORLDWIDE
Real Women. Real Wardrobes. Real Results.
See why women trust Numi to protect their favourite pieces.
What makes Numi different
Built-in protection so light, it feels like wearing nothing at all.
The underarm shield
A built-in moisture-transfer system absorbs sweat before it can reach your outer clothes — invisibly, all day.
Lightweight, breathable fabric
Modal fabric feels smooth against the skin, stays invisible under clothing, and moves with you like a second skin.
Protect your wardrobe
Designed to keep cashmere, silk, and blouses cleaner longer — so you wash less, wear more, and stretch the life of every piece you love.
Frequently Asked Questions
How does the underarm shield work?
Numi has a built-in moisture-transfer layer in the underarm area that absorbs sweat and prevents it from reaching your outer clothes. It's invisible from the outside and works all day.
Will it show under my clothes?
No. Numi is designed to be invisible. The lightweight modal fabric lays flat against your skin and doesn't add bulk under sweaters, blouses, or fitted tops. The neckline options are designed to sit lower than most outer layers.
How do I find the right size?
Numi fits close to the body. If you're between sizes, we recommend sizing up. Each product page has a detailed size guide based on your bust and underbust measurements.
What's it made of?
Our modal undershirts are made from MicroModal® — a lightweight, breathable fabric known for its softness and moisture-wicking properties. Our merino wool styles use ethically-sourced merino for warmth and odor resistance.
How do I care for it?
Machine wash cold, lay flat or hang to dry. Do not tumble dry or iron the underarm shield area. With proper care, your Numi will last for years.
What if it doesn't fit or I don't love it?
We offer a 30-day money-back guarantee and free exchanges. If your Numi isn't right, we'll make it right.
Where do you ship?
We ship to the US, Canada, Australia, New Zealand, UK, and UAE. Free shipping on orders over $100.
Your wardrobe is ready when you are.
20% off your first order. Use code NOSWEAT at checkout.
Get 20% off my first order
