Gerbing Heated Jacket Liner - 12V Motorcycle Protective Gear with Taffeta Lining, 7 Microwire Heat Zone - Battery Heated ClothingJACKET SIZING: This Jacket runs a bit larger than the size chart suggests. If you're on the lower end of the measurement scale shown. A size smaller is recommended. FUNCTIONAL DESIGN: Suitable to be worn by riders, the jacket liner has a low profile elastic cuff for improved fit under the outer jacket. The heated apparel has a drop tailback for improved coverage while riding. MICROWIRE SYSTEM: The heating apparel features seven Microwire powered heat