The Therm-ic C-Pack 1300 BT is must have luxury for skiers who are always fighting cold feet and toes on the mountain. This set includes battery packs and a USB charger that deliver up to 13 hours of warmth to your feet. Three different heat settings allow you to have the perfect amount of heat on your feet. The heat settings are adjustable by either the single button control or a Bluetooth connection on your smart phone. The USB charger gets your batteries fully charged very quickly so you are ready to get in line for first chair on that powder day. Not only a comfort option, many skiers and racers use Therm-ic heating systems to boost their performance. Cold feet decrease your balance and muscle dexterity, warm feet ski better. Bluetooth Compatible, Single Control Button, USB Charger Included, Compatible with all Ski Boots and Insoles, A Must Have for Skiers with Diabetes or Raynaud's, Does Not Include Heating Elements or Cambrelle Covers, Warm Feet for up to 13 Hours, Model Year: 2022, Product ID: 544901, Model Number: T41-0101-200, GTIN: 3661267096105