Support tank, shimmel, long top—no matter what you call it, this bra-and-tank-in-one top is a must-have for stay-cool summer workouts.

To find the best of the new spring and summer bunch, my curvy, short-trunked self and a tall, willowy friend tested dozens of contenders for fit, function, and (of course) fashion. These six stars shone the brightest. View the slideshow.