Using carbon-fiber heating technology powered by a compact and unobtrusive rechargeable battery, this windproof, fleece jacket generates safe, low-power far infrared rays, similar to the light waves that occur naturally in the sun, that penetrate the skin's surface, warming your chest and back for up to five hours. Heat is transmitted through the carbon fiber mesh sewn into the chest and back of the jacket, and the laminated microfleece fabric traps heat close to your body. The three heat settings are easily manipulated by a controller that stores comfortably in an interior pocket. Includes one lithium-polymer rechargeable battery with AC adapter. Hand wash. Unisex size X-Large (46-49).