Champion CH659 Womens Running Socks 2-Pack 97% Polyester/ 2% spandex/ 1% other C Vapor technology is designed to adapt to your body temperature Wicks moisture away from skin for cooler, drier comfort. 97% Polyester/ 2% spandex/ 1% other Compression arch support provides a secure, contoured fit. Left-right specific for an enhanced fit.