Keep the heat happening with additional ProFLEX insole batteries. These spare units allow you to have an extra battery charged and ready to go when and wherever you need it. Simply reload batteries without removing the insoles from your boots or shoes.
Additional ProFLEX insole batteries (sold separately) include a wall charger (with a USB cable) and two cushioned battery packs. Extend heating without removing insoles from shoes or boots. Batteries recharge in four hours or less and last up to five hours per charge. The charging system can also be unplugged and used as a protective carrying case for the batteries.