Size: For left or right arm, this support has been designed to create a customized fit for most body types. Measure around forearm below elbow. Adjust to Fit: 7.0 - 14.0 in. When to Use: This patented Futuro Sport Tennis Elbow Support is designed to help provide relief from general pain and tenderness in the forearm and elbow caused by activities requiring a string grip or active finger movement. Its use is not limited to tennis players. Washing: Close fastener before washing. Hand wash with mild soap in warm (not hot) water. Rinse well and air dry. Do Not: machine wash, tumble dry, dry clean, or use bleach or fabric softeners. How to Wear: 1. Pull fastener through buckle, with the tendon pad cushion against skin. 2. With fastener facing out, position tendon pad cushion below the elbow towards outer forearm. 3. Tighten the strap until the fit is snug, yet comfortable.