The Undershirt for Your Wardrobe
A slim, lightweight layer between you and your favorite pieces so you can feel confident and keep them at their best.
Shop Collections
Every Numi undershirt protects the pieces you care about. Build your collection to suit any neckline, sleeve length, outfit, or weather.
Shop Modal
Thermo-regulating modal for lightweight, breathable softness. Perfect for everyday wear. Available in multiple styles.
Shop Mesh
Whisper Weight Mesh—an ultra-light, barely-there fabric that’s sheer and effortlessly feminine. Available in multiple styles.
Shop The Crop
All the benefits without the extra fabric. Designed for those who prefer high-waisted bottoms, cropped tops, or just fewer layers. Available in mesh and modal.
Shop by Solution
Your wardrobe, upgraded. One problem-solving piece at a time.
How the Shield Works
Numi's built-in underarm protection, thoughtfully integrated into every undershirt. Its technical cotton layer helps absorb perspiration and deodorant before they reach your outer clothing, helping keep your favorite tops looking fresher for longer.
Premium Materials
The shield is made from ultra-soft cotton for exceptional comfort and breathability. Undershirts are available in multiple fits, necklines, sleeve lengths, and materials.
Engineered Moisture Control
The shield is engineered to draw perspiration away from your skin and into its absorbent core, helping keep moisture away from your clothing.
No Plastic Layer
Unlike disposable underarm pads, the shield contains no plastic layer, just breathable cotton designed for everyday comfort.
Built for Comfort
The shield is permanently sewn into every Numi undershirt, so it won't shift, bunch or move out of place.
Worn in Real Life
Written Reviews
I stopped taking my cashmere to the cleaner. That's it. That's the review.
I wore The Signature under a silk blouse in a July board meeting and there was nothing to see.
Snug without feeling tight. I forget I have it on until I take my blazer off and everything is still dry.
I bought one to test it and three more the next week. My good knits go twice as long between cleans now.
The sleeve edge is the part nobody talks about. No elastic digging in, nothing showing through a fitted shirt.
I travel constantly and this is the one thing that goes in every bag. Washes cold, dries overnight.
Numi is on a mission to ensure every woman feels as good as she looks in her clothes.
So we made the world’s first undershirt just for women. Sweat-proof, ultra-comfortable, and confidence-boosting by design.
