Designed to assist in pain relief from Diabetes, Arthritis and Raynaud's Disease. Natural heat therapy gently warms ankle and foot. The patented Trioxon lining has been clinically proven to increase surface skin and subcutaneous temperature between 2-3° F. and allows the skin to ventilate and wicks away moisture for hours of comfortable wear. Open design Velcro closure makes it easier to fit. Includes a removable side stabilizer for additional support if needed. Fits left or right foot. Latex free.