The ActionHeat Vest Liner is a great option for those who want to stay warm without all those bulky layers. Designed to be worn over another garment or under a jacket, the ActionHeat heated Vest Liner has built-in heat panels that keep your torso warm. The heated garments use FAR infrared heating and ActionWave heat reflective technology to deliver hours of heat and comfort to enjoy outdoor winter activities. Whether you are hunting, tailgating, or enjoying the winter season, the ActionHeat 5 Volt Heated Vest Liner is ready to keep your warm!