Mountain Hardwear Stamina Double Bra

This racer back sports bra is an innovative, cool looking crop-top; technical wicking fabric with excellent two-level adjusting support for medium breasts. Double layer increases warmth, but venting panels are provided; straps very thin so might dig in; strap adjusters rest uncomfortably on collarbone with backpack.

Verdict: Buy it if you have medium boobs and want a very secure crop-top to wear without a backpack for high-impact activities.