Columbia Women's Ombre Stripe Racerback Bra 57% Nylon, 37% Polyester, 6% Spandex Imported Machine Wash Medium support sports bra for cross training, biking, or and hiking Seamless and non-chafing Racerback design allows for full range of motion, maximizing comfortability and reducing bounce Omni-wick advanced evaporation pulls moisture away from the body and enables perspiration to evaporate quickly, keeping you dry and comfortable Removable cups for enhanced shape and coverage. Elastic binding for support