People around the world attest to the healing benefits of Far Infrared treatment. The effectiveness of this four-way stretch support is enhanced by ceramic far infrared emitting elements. These elements, composed of oxides of zirconium, aluminum, zinc, titanium and antimony have been the subject of studies around the world and are believed to retain body heat and emit safe far-infrared rays that penetrate deep into the joint and surrounding tissues which increases blood flow, reduces inflammation and decreases pain. This elbow support, stretches in all directions, promoting strength and circulation, providing comfortable support for the elbow. Light compression counteracts tissue swelling. Try it for tennis elbow! Fibers have an anti-bacterial treatment that inhibits bacteria growth. This item contains Latex For a correct fit, measure 3" below the elbow. If your measurement borders two sizes, select the next larger size. Size Elbow Size > Small 7.5 in - 9 in > Medium 9 in - 10.25 in > Large 10.25 in - 11.5 in > X-Large 11.5 in - 12.75 in