Retains heat to reduce discomfort.Helps minimize swelling.Fits both right and left ankles.Sold individually. Retains heat to reduce discomfort of tendinitis while providing compression to help support and minimize swelling. Black. Reversible. Measure ankle at widest point. Fits both right and left ankles. Sold individually.To size, measure ankle at widest point.SizeMaleSmallMediumLargeX-Large6 - 8"8 - 10"10 - 12"12 - 15"