Heatable Cotton Jacket for Active Warming - Perfect for Sports and Outdoor Activities

Key Points:

1. Batteries are not included.
2. Our sizing is Asian, which tends to run 2-3 sizes smaller than European sizes. Please refer to our size chart to ensure a proper fit.
3. We recommend using batteries with high USB Power Delivery (measured in watts) for optimal performance. Higher USB Power Delivery results in higher heating temperatures. (Output Power (W) = Voltage (V) × Current (A). For example: an output power of 10W = 5V * 2A / an output power of 22.5W = 5V * 4.5A)
4. For jackets with 2/4/8/9 heating zones, it is advised to use batteries with an output power greater than 10W.
5. For jackets with 11/13/17 heating zones, it is recommended to use batteries with an output power greater than 15W.