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 and under a jacket the ActionHeat heated Vest Liner keeps your torso warm. ActionHeat battery heated apparel utilizes innovative technology designed to warm the core body temperature. These revolutionary garments feature built-in heating panels and are made with ActionFlex material that provides lightweight warmth comfort and versatility. ActionHeat heated garments use FAR infrared heating and ActionWave heat reflective technology to deliver hours of heat and comfort. ActionHeat allows you to stay warm and enjoy outdoor winter activities longer than ever before. Whether you are ready to ride around town on your motorcycle hunt tailgate or enjoy the chill of the season the ActionHeat 5 Volt Heated Vest Liner is ready to keep your warm!