Christina is 5&
Christina is 5'10" and wearing a size S
Elyse is 5&
Elyse is 5'9.5" and wearing a size XS
Christina is 5&
Christina is 5'10" and wearing a size S
Cassandra is 5&
Cassandra is 5'11" and wearing a size L
The Signature Undershirt
The Signature Undershirt
Christina is 5&
Christina is 5'10" and wearing a size S
Christina is 5&
Christina is 5'10" and wearing a size S
Elyse is 5&
Elyse is 5'9.5" and wearing a size XS
Elyse is 5&
Elyse is 5'9.5" and wearing a size XS
The Signature Undershirt
The Signature Undershirt

The Signature Undershirt

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Buy 2, Save $15

Free Shipping over $150 (After discounts, before shipping and taxes). For international orders, please see our Shipping page.

Reimagined Basics

Everyday styling should be easy. Our hero product was designed to liberate your wardrobe. You call it a game-changer, we call it a better base layer. Either way, it’s our top seller for a reason.

 

Our Essential Undershirt collection was designed to keep you feeling fresh and your clothes clean.

  • Absorbent underarm gusset with Contemporary Cotton Technology
  • Thermo-regulating TENCEL™
  • Invisible fit
  • Reversible neckline with a scoop or crew neck
  • Seamless sleeves
  • Made in Canada
  • 90% TENCEL™ is soft, breathable and keeps you cool and dry
  • 10% LYCRA® for optimal stretch and comfort
  • Fabric is responsibly knit and dyed in Canada
  • Machine wash cold, tumble dry low
Being mindful of our impact has always been at the core of what we do. This year we’re taking it further. We are in the process of auditing our impact. Stay tuned, we'll be sharing the results later this year.

Free shipping on U.S. and Canada orders over $150. All full-priced orders are eligible for free returns within 30 days of your delivery date.  

Items purchased at 30% off and above are final sale. Find out more about our return policy here.

Explore Our Fabric Technology

Sustainable Silk™

Meet the easy wear, easy care Numi silk collection. Wear your silk whenever, however. Stylish pieces made from Numi's Sustainable Silk that look and feel beautiful and are free from the standard silk stresses like staining and dry cleaning.

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Contemporary Cotton™

Liberate your wardrobe.  The Essential Undershirt, a cult product that changes lives and dry cleaning bills.  Wear that favorite shirt without a care.  Sumptuously soft base layers that keep you feeling fresh and clean, today and tomorrow.

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Forward Thinking Materials

Functional fabrics designed to make your life easier and be kinder to the planet.

Contemporary Cotton™ is a high-performance moisture management system that moves moisture away from the body.  It keeps you cooler and drier.  And washes clean of odors. 

Sustainable Silk™ is a blend of Naia™ and silk. It is treated with bluesign® certified stain repellent technology making the garment stain resistant and machine washable.

About Numi

Numi was born out of personal necessity. One day our founder, Michelle, realized she never wore her favorite clothes. They were either prone to noticeable sweat stains or expensive to dry clean. When she looked for a solution, there was nothing available. And so Numi was born.

Numi is a brand that celebrates what it means to be a woman. We make consciously created products that make life a little easier for us all and inspire a culture of kindness.

Committed to Sustainability

Being mindful of our impact has always been at the core of what we do. We like to think of it as a living commitment that grows and evolves with us. This year we're taking it further. We are in the process of auditing ourselves to see how and where we can be kinder to the planet.

LEARN MORE

Customer Reviews
4.8 Based on 520 Reviews
5 ★
80% 
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4 ★
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3 ★
2% 
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Customer Photos
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Filter Reviews:
FM
07/13/2022
Farnoosh M.
United States

Amazing undershirts

Wow, this is the perfect undershirt - especially for purposes of preventing sweat stains!

  • Which size did you purchase? S
  • How was the fit? True to Size
  • Reason for Purchase Environmental: for less dry cleaning & washingFunctional: for preventing sweat stains
LA
07/10/2022
Lauren A.
United States United States

Love these!

This was my first Numi purchase and I couldn't be happier! These under shirts are comfortable and really help extend the life of my clothes by reducing washing. I bought my shirt in my usual size and it fit as intended. It's definitely tighter than most of my shirts, but still comfortable. It is intended to be rather tight so it isn't seen underneath your shirts. If you are intending to wear this alone (Without a shirt or dress on top) you may want to size up. But if you want to wear this under your shirts, it is true to size!

  • Which size did you purchase? XS
  • How was the fit? True to Size
  • Reason for Purchase Everyday Essential: for comfort & styleFunctional: for preventing sweat stains
MB
06/13/2022
Michelle B.
United States United States

Perfect work top

I got these in every color to wear under blazers at work. They are the perfect weight for comfort and easy to tuck in. I sized up from XL to 1X since I’m wearing it as a top.

  • Which size did you purchase? 1X
  • How was the fit? True to Size
  • Reason for Purchase Everyday Essential: for comfort & styleEnvironmental: for less dry cleaning & washingFunctional: for preventing sweat stains
JG
05/26/2022
Jaclyn G.
United States United States

Love the sweat protection!

I got this shirt because I use natural deodorants and they don't work as well as antiperspirant, which is fine except at high stress situations at work. This shirt protects my blouse and keeps me odor free. I also got the crop which I love even more because I don't have to worry about tucking it in, and the ballet. The shoulders on the ballet slip off a bit, so the signature and signature crop are definitely my favorites!

  • Which size did you purchase? S
  • How was the fit? True to Size
  • Reason for Purchase Environmental: for less dry cleaning & washingFunctional: for preventing sweat stains
AB
05/26/2022
AMANDA B.
United States United States

Saves my Clothes

Working in an industry where I have to wear suits I was spending a lot of money replacing blouses that were stained from sweating so much. These crop tops have been a lifesaver! I no longer have to replace tops every year, and don't have the embarrassing sweat stains (which has boosted my confidence beyond imagine!)

  • Which size did you purchase? L
  • How was the fit? True to Size
  • Reason for Purchase Environmental: for less dry cleaning & washingFunctional: for preventing sweat stains

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