Zensah Thigh Sleeve 90% Nylon / 10% Spandex Made in US 90% Nylon10% Spandex Compression technolgy found in each thigh sleeve helps the hamstring and quadriceps muscles to rebuild themselves after a workout or injury, leading to a faster recovery Features graduated compression which increases circulation and oxygen blood flow to reduce swelling and aid in post-run / post-workout activity Ideal care is machine wash cold, and delicate machine dry.