Additional 1/8 oval pad retains body heat to warm knee joint and increase blood circulation.Helpful for post-operative knee problems, strains, arthritis and protection against abrasions.Stratch fabric inside ensures comfort during wear and makes LP knee support easy to slip on or off.Size:Measure around mid-section of the knee while in a standing position. 11⅛ - 12⅞13 - 1414⅛ - 1515⅛ - 1717⅛ - 20 (29.2-32.7cm)(33-35.6cm)(35.9-38.1cm)(38.4-43.2cm)(43.5-50.8cm) X-Small. Small. Medium. Large