Thorlos Experia Unisex XCCU Multi-Sport Thin Padded Low Cut Sock, Mulit-Colored, Medium 65% Thor-Wick COOL polyester, 20% Nylon, 14% polyester, 1% Elastic Made in US No Closure closure Turn Inside Out / Machine Wash / Use Liquid Fabric Softner Ultra lightweight sock with frame construction provides contoured glove like fit Sculpted pads in the ball and heel provide protection from sheer and impact in critical strike and impact zones Achilles tendon pad protects against rubbing and chafing while functioning as a heel lock Mesh polyester for maximum breathability