Provides compression for weak or overstressed knees retains body heat to warm knee joint and increase blood circulation helpful for post operative knee problems strains arthritis minimizes chance of future injuries measure around the mid section of the knee while in a standing position small 33 7 35 9 cm medium 36 2 38 4 cm large 38 7 43 5 cm xl 43 8 51 1cm xxl 51 4 56 2 cm