The spring wardrobe event
Your third is on us.
Buy 2 undershirts, and get 1 free.
Shop undershirtsCode WARDROBE applies automatically at checkout. Cannot combine with other offers.
"This is my third shirt. My original 2 from over a year ago are still in good shape. The shorter sleeve and cute edging were the driving factors for purchase."
— Tiffany S.
"The Crop is my third Numi shirt (two regular length) and I think I like this more — especially to wear under blouses as we move to warmer weather. Definitely a must for your undergarment collection."
— Ciara S.
"Amazing undershirt. I have 6 that I rotate through all year round. Even got my co-workers wearing them."
— Jenna H.
"Love these so much that I now have 3. Essential for commuting by subway for work."
— Alexandra V.
"This is my second Numi undershirt purchase. I sweat, and these shirts keep my clothes from getting sweat stains and from any unpleasant odor. The fit is comfortable and form-fitting, and I don't feel like I've got on another unnecessary layer."
— Linda D.
"I have 5 of these shirts. Wear them everyday. Love, love, love them."
— Carrie
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XSSMLXL+1The Signature Undershirt $65.00 /AlmondBlackToffeeBlushTruffleNavyWhiteGreyCharcoal4.68 reviews![#color_white]()
XSSMLXL+1- Back In Stock
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XSSMLXL+1The Square Neck Cap Sleeve Undershirt $65.00 /BLUSHTRUFFLETOFFEEALMONDWHITEBLACKCHARCOAL4.37 reviews ![#color_black]()
XSSMLXL+1![#color_almond]()
XSSMLXL+1![#color_black]()
XSSMLXL- New Arrivals
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XSSMLXL - New Arrivals
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XSSMLXL
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.
Soft, 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 and wear more.
OVER 400,000+ SOLD WORLDWIDE
Real Women. Real Wardrobes. Real Results.
See why women trust Numi to protect their favourite pieces.
Frequently Asked Questions
How does the underarm shield work?
A built-in moisture transfer system pulls sweat away from your skin in one direction, keeping it off your outer clothes. The shield is invisible under everything and works all day.
How do I find the right size?
Our undershirts run slightly small for a snug base-layer fit. If you're between sizes, size up. Check the size guide on each product page for exact measurements.
Will it show under my clothes?
No. Numi is designed to be invisible under V-necks, crew necks, blouses, and sweaters. The fabric is ultra-thin and the underarm shield is seamless.
What's it made of?
Our Modal line is 90% thermo-regulating Modal and 10% Lycra for stretch. Merino styles are 100% natural wool. Responsibly knit and dyed in Canada.
How do I care for it?
Machine wash cold, tumble dry low, wash with like colors. The shield technology is built in at the yarn level, so it never washes out.
What if it doesn't fit or I don't love it?
We offer 30-day returns and free exchanges within North America. Reach out to us and we'll make it right.
Where do you ship?
We ship across North America. Free shipping on orders over $100.
Start with a best seller
Your wardrobe is ready when you are.
The Signature is where most women start. Layered under cashmere, silk, and everyday cotton, it's the one that started it all.
Shop The Signature
