The Gerbing Heated Motorcycle Jacket Liner provides warmth to the chest, back, sleeves, and collar. It's a 12-volt piece that wires to the bike and fits easily under any riding jacket. While battery-operated pieces can be more convenient, the unlimited power of a hard-wired piece is too good to pass up. There's nothing worse than feeling the warmth slip away as the battery dies halfway to your destination. Plus, Gerbing is a solid heated gear brand that has pant liners, glove liners, insoles, and socks that can all connect for complete warmth. We're positive that once you or your favorite rider tackles winter with some heated gear, there's no turning back.