When you need the most warmth a heated base layer is the answer. Not only are the heating panels close to your skin wearing another layer such as a regular shirt vest or jacket over the base layer traps the heat so you stay warmer longer. The Gerbing 7 Volt Base Layer Shirt is the ideal battery heated top for your winter weather activities. Now you can enjoy hours of tailgating hunting sports working in cold environments or just lounging around the house with the addition of the Gerbing Heated Base Layer to your wardrobe. The comfortable stretchy and soft fabric easily moves with you while the gentle heat on your chest and back soothes you for hours. Easily change the heat settings with the tap of a button. It couldn t be simpler! The Gerbing 7V Battery Heated Base Layer Shirt will be your next essential winter garment. HOW TO USE: 1. Charge Up? Fully charge 7V battery with provided charger cable. 2. Plug-In? Connect the battery. 3. Turn On? Press and hold touch-button control on the chest