Thorlos Unisex AMX Fitness Thick Padded Ankle Slouch Sock, White, Medium 69% Exclusive THORLON acrylic , 23% nylon, 5% spandex, 2% polyester, 1% Other Fiber Exclusive Thor Lon acrylic wicks moisture better and provides thick cushioning to absorb impact and shock Spandex in the arch and instep for greater support and stability