Under Armour Boys Phenom 2.0 Crew (3 Pack) 74% Polyester/24% Cotton/2% Spandex Imported Ergonomic contour Technology delivers true left-right anatomical fit True seamless toe reduces irritation 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 ArmourDry material wicks moisture, accelerates evaporation