Under Armour Boys HeatGear Crew Socks (3 Pack) 97% Polyester/3% Spandex Imported Strategic cushion reduces bulk, delivers flexibility and breathability Dynamic arch support helps reduce foot fatigue Ventilation channel integration enhances breathability 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