Therm-ic Powersock Set Heat Fusion Uni + S-1400B

The Therm-ic Powersock Set Heat Fusion Uni + S-1400B keeps your toes warm on bitterly cold days. The included S-1400B batteries last up to 16 hours, and can be controlled by your smartphone via Bluetooth. The Heat Fusion Uni socks wick away moisture thanks to Moisture-Vent Technology, and provide maximum comfort in your boots. A USB charger is included so you can charge both batteries simultaneously.