Why Wear an Undershirt?
Stops sweat stains, thanks to moisture-wicking underarm shields
Protects your clothes and saves money on dry-cleaning
Ultimate base layer, perfect for layering
Keeps you dry & cool all day long
Ultimate comfort, made with ultra-soft 4-way stretch fabric
Shop by Style
The Crop
Perfect for reducing bulk around your mid-section, especially when wearing high-waisted bottoms.
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The Square Neck
Designed with cap sleeves to seamlessly layer under all your shorter sleeved blouses. Features a flattering square neckline.
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The Three Quarter
Classic fit with sleeves hitting just below the elbow. It features a reversible neckline for added versatility.
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The Signature
Our #1 best seller is the ultimate base-layer for every outfit. No more sweat-stains or deodorant marks.
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We've got an undershirt style for every outfit
Find Your Favorite Fits
Varied Top Lengths | Range of Necklines | Different Sleeve Lengths & Finishes I All Sweat-Proof
STOPS SWEAT STAINS
ABSORBS MOISTURE & ODOR
LIGHTWEIGHT & BREATHABLE
4-WAY STRETCH
FITS TRUE TO SIZE
1000+ 5 Star Reviews
Our essential undershirts keep you cool & dry all-day long so sweat stains are no longer an issue
Jill M:
"I am blown away! Such an amazing product. I ordered one then immediately ordered two more. Exceptional."
Leslie B:
"Bought this to wear under sweaters and it is perfect! Soft, stretchy and comfy. I’ll be buying more."
Sara N:
"I can't believe I didn't buy these sooner. I sweat a lot and had just accepted sweat stains as a part of my life."
Katrina B:
"I love my Numi undershirts. I wear them pretty much daily under sweaters or blouses and I never have to worry about underarm stains."
The Wardrobe Essential You Didn't Know You Needed.
Imagine the confidence you’ll feel knowing that you’ll never have to worry about sweat & deodorant stains ever again.
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Sweat-Proof Undershirts: Your Questions, Answered.
Sweat proof undershirts are made of contemporary cotton with a unique underarm garment to prevent sweat stains from showing on the outer clothes. Our undershirts are made with moisture-wicking fabric that absorbs sweat and keeps you feeling dry and comfortable.
Make sure to check our sizing guide on the product page, next to the sizing choices. You can also take our sizing quiz to find the right size for you. If you’re still unsure, chat with us (pressing a chat box on the bottom left part) or send us an email at customercare@wearnumi.com.
Our undershirts are machine wash cold, tumble dry low. Please wash with like colors.