The ActionHeat Mens 5V-Battery-Heated Long-Sleeve Flannel Shirt is perfect for a ball game or hunting trip, with hidden heat panels to keep you warm and comfortable for hours. This ActionHeat heated shirt has 3 built-in heating panels that are strategically placed on the chest and upper back to warm your bodys core temperature. It has a button front, long sleeves, and classic lumberjack style, with FAR infrared heating and ActionWave reflective technology. The system utilizes 5V rechargeable batteries and comes with a powerful 6000mAh power bank that can also be used to charge your phone, tablet, or any USB device. Touch-button adjustment provides warmth for 2 hours on high, 3 hours on medium, and 4.5 hours on low. The ActionHeat 5V Battery Heated Flannel Shirt for men includes a power bank and USB charging kit. 100% polyester with ultra-fine carbon fiber heating panels. Machine wash. Imported. Sizes: S-2XL. Colors: Red. Type: Long-Sleeve Shirts.