Under Armour Men's HeatGear 3-Pack Crew 49% Polyester, 35% Cotton, 14% Nylon, 2% Spandex Imported Athletic crew socks Moisture Transport System wicks sweat away from the body Anti-odor technology prevents the growth of odor-causing microbes Embedded arch support reduces foot fatigue Seamless toe & contoured "Y" heel for the perfect, comfortable fit