Evolution Tank

Merging the seamless support of our Evolution Bra with the cozy comfort of your favorite tank, we've created a sleek base layer that easily transitions from work to play. It's the shelf-tank for the 21st century.

Classic Colors
LTD Edition
Questions & Answers

Evolution Tank Essentials

Forget that lousy shelf tank you have from the 90s. This bra/tank combo is from the future.
Built-In Bra
Bonded, wire-free construction lifts the chest for secure, comfortable support
Removable Cups
Thin, breathable cups add shape and coverage without the bulk.
Seamless Versatility
Comfortable on it's own, or seamlessly invisible under whatever you're wearing.
"This is the most PERFECT all-in-one tank I've ever found."

– Pam P.

Read More Reviews

How It Fits

Designed for cup sizes A to DD. It'll fit soft and snug with powerful construction that lifts the chest for secure, wire-free support. 


Body: 62% nylon, 38% spandex
Lining: 92% nylon, 8% spandex


Machine wash cold with mild detergent, do not bleach, lay flat to dry.

This product fits seamlessly under dresses, suits for work, sweaters and...skin tight shirts.
Judith K.

Tech To Take

Your Life Back


We're done with uncomfortable underwear. With 4-way stretch fabrics, your Knix move and mold to your shape.


Each Knix product is tested by 1000s of real women to make sure it's ready for your real life.


Moisture-wicking. Anti-odor. Quick-dry. Because we know what it takes to conquer your day.

Our 30 Day Guarantee

Put it to the test! Wear it to work, to yoga, to the jungle - it’s your call. Give it a couple washes. Fall in love with it. And if you don't? We can help you get into a better fit or take it back, no questions asked.

Evolution Tank Reviews

Q & A


Q: Is there a way to sign up for a waiting list, or some kind of notification when XL is back in stock? Will they be back in stock?


A: Yes! You should have the option to sign up for a Back in Stock notification located under the product page.