Under Armour Women's Athletic Solo Socks (3 Pack) 80% Nylon/18% Polyester/2% Spandex Imported Strategic cushion reduces bulk and delivers flexibility Precision y-heel pocket improves fit and enhances comfort ArmourDry material wicks moisture, accelerates evaporation ArmourBlock technology helps prevent growth of odor-causing bacteria in the sock Dynamic arch support help DS reduce foot fatigue