The Burton Toaster Snowboard Boot Liner warms your snowboard boots up in less than a minute with a low-profile built-in heating system that cranks warmth at a low, medium or high setting. A single charge of the built-in battery lasts two to five hours and the system recharges using the included micro USB cable, eliminating the need for bulky charging units, batteries, or disposable warmers. Available in men\'s and women\'s fits and compatible with any adult Burton snowboard boot featuring an inner cuff built into the shell.