CW-X Conditioning Wear Adult Performance Calf Sleeves 90%Polyester/10% Spandex Imported Seamless stretch fabric and our CW-X patented compression support sleeve reduces fatigue, promote recovery and support calf muscles Graduated compression and built-in support panels enhance blood flow, reduce lactic acid build-up and enhances recovery Features a reflective strip on lateral sides of each leg Item sized by calf circumference for exact fit and support