The secret to staying warm in almost any situation is to keep your body's torso insulated. The Hotwired Heated Vest Liner does that as well as providing constant heat. Carbon fiber heating elements have been woven into 4 key areas on your chest, back and collar and feature three different temperatures settings. The Hotwired Heated Vest Liner allows you to change your heat settings on the fly with an integrated smart soft touch controller built into the vest. Simply hook up the included battery harness to the bike and your vest and enjoy the warmth.; Made from 100% polyester Carbon fiber heating elements 4 Heating zones Built in thermal protector with and automatic shut off Draws 37 Watts (3 Amps) Integrated temperature controller with 3 heat settings Includes battery harness Two year warranty