Under Armour Women's Seamless Low Long Heather Bra , Pitch Gray (012)/Black , Small

I'm a 36B and got a Medium. Love it because it doesn't feel like it's suffocating me but also provides just enough support! Got the turquoise color and it is so pretty in person!

These bras are insanely comfortable but I find that the chest band runs a full size small, at least for my taste. But then, I've been wearing minimalist bralettes for close to a decade so my tolerance for compression around my rib cage is pretty low. If you're used to wearing tight sports bras or underwires then going with your normal size might work. The tall chest band stays put nicely (no riding up, unlike every other bralette I've tried recently) but doesn't feel like too much fabric, and the bra is incredibly soft and stretchy. Also, I thought that the criss crossing straps in back might be irritating but I actually don't even notice them. And the fabric is thick enough that I don't feel the need to use the inserts, which is nice so that my skin can breathe more. Hoping that Under Armour never stops making these!