back on track physio knee pads 4way stretch welltex® knee support (size_name : medium) back on track the back on track + physio products are designed to provide a comfortable four-way stretch in a supportive brace. intended for daily use by people with an active lifestyle, these braces are made with our state-of-the-art welltex technology, which is infused into the fibers of the braces. welltex technology works to reflect your body’s energy, creating a soothing far-infrared thermal effect. this effect can help to increase blood circulation and provide relief to tired and sore muscles, tendons, ligaments, and joints. the + physio knee brace should be used by active people who experience discomfort in their muscles, tendons, ligaments, and joints due to overuse, general exercise, or common injuries such as ligament, tendon, and meniscal tears. sizing to find your size, measure the circumference around your knee. small: 13"-15" medium: 15"-17" large: 16"-18" xl: 17"-19" xxl: 18"-20"