There’s only one heated insert for your shoes that’s rechargeable and has a remote control. The ThermaCell Rechargeable Heated Insole slips into your shoes and keeps your feet toasty warm in the Winter. With the built-in thermostat and wireless remote control, you can set the temperature to high, low, or off. The lithium-ion batteries can go for 5 hours per charge and are good for 500 charges.
This is way more versatile and longer-lasting than those one-time use hand/foot heaters. It’s more competitive with heated boots costing twice as much and you can use any boot or shoe with it (even skates or ski boots). That’s hot.