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:Charge Up– Fully charge 7V battery with provided charger cable.Plug-In– Connect the battery.Turn On– Press and hold touch-button control on the chest to turn on and adjust the temperature.Features:Machine washable/gentle cyclePowerful Microwire heating system includes built-in heating panels strategically placed on the chest and upper back to warm your bodyTouch-button control technologyBattery Voltage: 7 VoltColors Available: Black with AccentsMaterial Content:92% polyester and 8% spandexEstimated Heating Times:High (Red): 135F – 2.5 HoursMedium (Yellow): 115F - 3.5 HoursLow (Green): 105F – 5 HoursIncludes:(1) Gerbing 7 Volt Base Layer Shirt(1) Gerbing 7V 2,600 mAh Rechargeable Battery(1) Single Wall ChargerGerbing Lifetime Warranty