This is a great shirt. I've worn it during my usual bike ride to work in 30 degrees Celsius (86 Fahrenheit), and there was no sweat on my clothes afterwards. This will be a lifesaver. I purchased my usual size S (even though the size questionnaire recommended to size up), which might have been a mistake because it's tight-fitting, especially with the extra underarm material, and I'm used to loose clothing. But I don't feel it that much during the day so I think it's just a matter of me personally getting used to more snug clothing.
All in all, if you're fighting with sweat stains, this is an item for you, and if you're not sure about the size, listen to the Numi algorithm :)

Wasn't sure if I would benefit from the addition of lace to my newest Numi, but it is wonderful! I wore my black Lace Numi with a floaty wrap/scarf and received lots of compliments. I felt beautiful and comfortable at the same time. Thoroughly recommend!

I hadn't tried the bodysuit before but wish I had. Beautiful fit and great protection.

Ok I was totally skepticism at first, this product seemed too good to be true. Like I can actually wear the colourful tops I’ve always wanted to wear? That cute faux denim one piece? I swear I wore that one piece with the Numi top from 10am to 5pm running around hosting and preparing for an outdoor event. I was SWEATING! Let me tell you, I looked ON POINT! I was so comfortable and was so shocked that I could raise my arms no problem. I highly recommend this product.

Wear these under my work shirt every day, keeps me warm and dry and I get more use out of my dress shirts!

I just love these! Fabric is so soft and comfortable. Fit is great, true to size. I love that I can protect my delicate clothes from unnecessary washing! It will keep them looking great much longer. And of course, no visible wet underarms!

I wear them every day. Bought crop tops now in addition to regular length shirts for summer pieces and night rise pants. Love them in summer and winter.

Ok I'm totally impressed!
I wore mine for the first time while traveling (which ended up being about a 15 hours day, including 2 different flights). I wore it under a light grey shirt...risky business! That grey shirt would normally not survive the trip without being drenched in sweat in the armpit area. I would always hide it with a cardigan or something on top...not this time !!!
It was still dry even after carrying/lifting heavy bags, feeling the summer heat in a crowded boarding process, being squished in an airplane middle seat, walking from gate to gate to catch the next flight and of course the usual stress of a travel day.
The undershirt was sweaty on the inside, but it never showed on my light grey shirt!!!
Numi is pure MAGIC !!!

Numi tops are incredibly comfortable and go with casual jeans to a dressy skirt and wrap. I got 2 in the standard length, but may get a couple more in a crop or try a longer sleeve. Love these!

I loved this top! So comfy. Great material. Worked amazing on a hot summer day! Super cute I am obsessed

Very comfortable

Comfortable and makes me feel more confident. No sweat marks and less dry cleaning.

Love my Numis and as soon as the weather cools down I will be breaking them out with my cashmere sweaters.
Wish you would make some with built in shoulder pads though — my shoulders slope and a Numi Signature with a shoulder pad would go a long way to make the line of my shoulders more attractive.

I’ve been trying to be very mindful of the clothes I buy and wear. My Simone Numi is a perfect addition to my “core” collection of clothing.

I wear these undershirts daily. Excellent quality, has a bit of hold like shape-wear too!

wear these every day

This is my go-to now for under all of my blouses and any non-breathable shirts. I never have to worry about embarrassing sweat marks - thank you!

This is a perfect shirt on its own for a hot day or as a camisole. It’s super breathable and love that it’s machine washable. Needs slight ironing if you don’t hang dry. Highly recommend.

I have been wearing Numi for years now. I wish I had then during my corporate days -my answer to stress sweat while giving a presentation was to put paper towel under my arm pits ….. never worked. Now I’m cool and confident. I have all the styles and in every colour.

This has been a game changer for work-attire. Very soft, and I love the comfort of not having pit stains!

I bought an almond and white. They help so much with underarm sweat and make me so much more comfortable that my blouses and sweaters won't get stained! I wouldn't mind if Numi developed a version that sucked in my tummy a bit. ;)

I chose the boatneck crop to be discreet under tops and dresses. I am going to trim the sleeve length a little (I did this already on another Numi undershirt) but otherwise love it.
I have a size small in the original crop but had to go down to XS in the boatneck as it was loose in the shoulders. I am 5'4", 118 lbs and 34" bust, usually wear XS if loose or S if fitted.

Love the fit and comfort. I am 9 months post partum and it feels good to wear something with elasticity but not constricting.

This is my third Signature shirt. They are essential to my wardrobe because I have severe underarm sweat issues. I wear them under all my shirts with sleeves. However, I purchased an XS but I think a S came. It is bigger than my other XS Signature shirts. Unless the design has changed?

It's soft an beautiful. I can't wait to wear it to work. It's a good fit with a slim look but not tight. The length is perfect for my petite frame, not too long so I can wear it untucked too!