Gerbings 12v Jacket Liner-Unisex-Motorcycle-Xlarge Heated Motorcycle Jacket Liner. Heating pads on the chest, back, collar, and sleeves. Thermal resistors installed on each individiual heading pad act as a solenoid to eliminate hot spots and overheating. Includes battery harness Power: 12V DC 6.4 Amp Build: Jacket liner that fits close to the body snugly under outer garments Materials: Minirip shell, taffeta lining