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ProFLEX Heated Insoles are the revolution in cold weather comfort technology. Now you can enjoy the benefits of the ThermaCELL Heated Insoles even longer with ProFLEX removable, rechargeable batteries. Simply swap out the batteries to extend the heated comfort without removing the insoles from your boots or shoes. Charge batteries using the included wall charger or any USB Port First heated insole with rechargeable, removable batteries and a remote control Electronics are defended from the elements through a unique manufacturing process Polyurethane foam is breathable and transfers heat efficiently Great shape retention and shock absorbency