The Therm-ic Heat Kit + C-Pack 1300 B Set adds discreet, ultra thin warmth to your favourite ski, snowboard, hiking, or everyday footwear. Ultra fine heating elements provide even warmth underfoot, while the self adhesive textile top cover offers comfortable contact and can be trimmed for a custom fit. The included C-Pack 1300 B batteries provide up to 13 hours of heat, with three manual settings and Bluetooth control through the Therm-ic Heat Control app for easy temperature adjustment on the go.