FootSmart Men's Cotton/Nylon Firm Support Over-the-Calf Socks Medical-grade graduated support sock provides a firm level of support (20-25mm/HG at ankle) Graduated support begins at the ankle, energizing and stimulating circulation to reduce swelling and aching Non-binding, breathable cotton / nylon fabric fits comfortably and securely over the calf; A reinforced heel and toe ensure longer wear Helps relieve: Circulation, DVT, Economy Class Syndrome, Edema, Heaviness in Legs, Leg Pain, Leg Veins, Spider Veins, Swollen Ankles, Swollen Feet and Legs, Tired, Aching Feet, Varicose Veins, Venous Insufficiency, Wide Calves Made in USA; machine wash on gentle cycle and lay flat to dry; for first-time wearers, we recommend Light to Moderate Support products to become accustomed to the feel of graduated support.