Therm-Ic SET Heat Flat + C-pack 1300 B

Flat insole heat pack + 1 pair of C pack 1300 Bluetooth rechargeable batteries. Up to 13 hours of heat to keep your feet warm. Very thin Heat Flat insole that easily adjusts to fit your shoe size. High quality heating elements to keep your feet warm. Fits all snow boots and ski boots. C Pack 1300 B batteries are equipped with Bluetooth technology, so you can control the power of your heater remotely from your smartphone.