STAY WARM - Therm-ic charging cables are necessary if you want to remain warm and comfortable during cold and chilly weather; It allows you to charge your devices to ensure you always have enough power to your insoles/gloves COMPATIBILITY - Powergloves/boot USB charging charger for Therm-ic Powergloves and Heated liners Therm-ic Inside; Pack Insole Usb Charging Cable for Therm-ic C-Pack batteries DURABLE AND FLEXIBLE - Therm-ic charging cables are well made with smooth outer that protects wire cores.