Under Armour Boys Unrivaled Crew Single Pair 65% Polyester/24% Cotton/8% Nylon/3% Spandex Imported Strategic cushion reduces bulk, delivers flexibility and breathability Ergonomic contour Technology delivers true left-right anatomical fit Reinforced heel and toe maximizes durability HeatGear fabric wicks sweat away from your skin to keep you cool, dry, and light ArmourBlock Technology helps prevent growth of odor causing bacteria in the sock