Unique non-compression design offers bust separation, shaping, and ultimate support by encapsulating breasts in full coverage, four-part cups- allowing you to get superior support from a single sports bra- no need for all the layers To convert to a racer back in a flash, lengthen the straps and connect the j-hook fastener Microfiber fabric wicks moisture away from the skin to ensure a comfortable and cool workout Microfiber-backed shoulder straps with a restricted stretch provide comfortable support 15% Nylon/Polyamide 8% Elastane 77% Polyester