Features:Electrically heated insole battery heater ski boot foot warmer. Keep your feet warm. With a smart thermostat. Breathable deodorant, can be cut freely. High quality and durable performance. Specifications: Color: Black Material: EVA Size: 35-39/40-44 yards (can be cut to your own size)3 Charging Methods: 1. Heating Adapter Power Supply 2. Heating the USB power supply of the computer 3. Power Bank Power Supply HeatingCaution:1. Due to manual measurement, please allow 1-3.0mm error. Make sure you do not mind before you buy.2. Due to different monitors, the product color may be slightly different. We hope you understand them.3. If you find any problems with our products, please leave us a message and we will be happy to solve the problem for you.1 Pair X Electric Heated Shoe Insoles1 X USB Line