53% Viscose Bamboo, 32% Elastic,12% Nylon, 3% Spandex Made in USA or Imported Why go for Recovery Compression Socks? The use of compression socks produces a major fluid shift improving venous blood return to the heart, allowing for better cardiac output thereby aiding oxygen delivery to working muscles. 8-15 mmHg (Mild Support), As a result, increased endurance and better performance are obtained during any sport activity. Our Graduated Compression socks are designed to stimulate circulation in those areas where gravity has a greater effect on blood return, such as feet and lower legs. Promotes Circulation, Odor Resistant and Wicks Moisture, Prevents Blisters, Comfort Sock, Non-Binding Support to Relieve Leg Fatigue. Sizing Guidelines: Medium (Sock Size 9-11/Shoe size 6-8), Large (Sock Size 10-13/Shoe size 8-10) Machine wash warm. Use only non-chlorine bleach when needed. Tumble dry low.