New Size MD = womens shoe size 7 up to 10.5 The Under Armour Women's Heatgear Volleyball Serve Socks also feature ArmourBlock technology to prevent growth of odor-causing bacteria in the sock, as well as convenient foot swipe zones, a must-have for volleyball players to keep their shoes clean on the court. * 86% Olefin / 12% Nylon / 2% Spandex. BUNDLE TO SAVE!