Unique hook and loop closure design to fit most calf sizes with adjustable support. Design to fit upper portion of the tibia and calf. Retains body heat to warm shine and increase blood circulation. Appropriate compression for lower extremity muscles helps increase blood flow circulation to not only improve endurance but also prevent lower extremity muscle strains. Washing Instruction: Hand Wash in cold water with mild soap. Rinse thoroughly. Air dry at room temperature. Do not machine wash and dry.