Helps prevent and treat stress injuries, especially recommended for ankle sprains or strains. Provides effective ankle support while walking or running. Fits comfortably inside shoes, boots or skates. Will not slip, wrinkle or bind and will be suitable for all sports and athletic activities. Fiber Contents 60% Polyester, 15% Rayon, 15% Rubber, 10% Nylon. Washing Instructions Hand wash in cold water with mild soap. Rinse thoroughly. Air dry at room temperature. Do not machine wash or dry. Should a rash or irritation occur, discontinue use and consult your physician. Size Guide Measure the circumference just above the ankle bone. Small fits 6 - 8 Inches (15.2 - 20.3cm) Medium fits 8 - 10 Inches (20.3 -25.4cm) Large fits 10 - 12 Inches (25.4 - 30.5cm) XL fits 12 - 14 Inches (30.5 -35.6cm)