Features: Heated Vest: A heated undershirt acts as a radiator to keep your body warm at all times. If you're going to be outdoors this fall and winter whether you're hiking biking camping or attending a sporting event a heated undershirt is the best way to stay warm for long periods of time outdoors. 5 Heating Zones: Professional heated undershirts add more heating zones compared to other older heated clothing they only have 5 heating zones heated undershirts cover 5 heating zones thanks to their fast heating technology built-in high quality carbon nanofiber heating elements light weight flexible and safe to use. Produces a steady heat to multiple parts of the body including the back abdomen and waist helping to keep the body warm. 3 Heating Llevels: Customers can choose the heating method according to their needs. Your body will be comfortable not sweating from overheating comfortable as spring. And the design of individual control makes your device more power-saving and durable. Safety Guarantee and The Required Vommon Battery Pack: Built-in thermal protection module. Once it overheats it will stop until the heat returns to the standard temperature so it is 100% safe to use. Use with ordinary USB port power bank you can choose high storage capacity power bank or prepare multiple batteries in advance. (Power bank not included) After-service: If you have any questions after receiving the product please feel free to contact us and we will provide you with a satisfactory answer. Size Shoulder Front length back length Bust Hem M 40cm 65cm 63cm 106cm 110cm L 42cm 67cm 65cm 110cm 114cm XL 43cm 69cm 67cm 114cm 118cm 2XL 44cm 71cm 69cm 118cm 122cm Specification: Material: Polyester Spandex Color: Orange Voltage: 5V includes: 1 * Vest "