With Thermic’s highest battery capacity to-date, the C-Pack 1700 B Battery becomes the ultimate cold climate companion. Suitable for use with Thermic Insoles and Heat Kits, this ultra-advanced accessory works seamlessly with a wide range of Thermic products and offers up to 17 hours of lasting heat. Its Bluetooth controllable heat settings are easily adjustable right from your smartphone, allowing the C-Pack 1700 B to immediately warm up or cool down with the touch of your screen. Complete with a USB charging chord for a lengthened lifespan, this all-weather accessory becomes the ultimate purveyor of big adventures with toasty toes.