Say goodbye to cold feet whether youre hiking climbing or on a motorbike the exo2 heatsole insoles will keep your feet warm using the same technology thats used in exo2s acclaimed stormwalker heated vest and jackets the heatsole uses fabroc heat panels to keep your feet at a self regulated 45 degrees c the included lithium ion battery pack is able to deliver 5 to 7 hours of warmth per charge single insole length cut to size and leather covered for comfort breathability tiny li ion power