ThermaCELL Heated Insoles ProFLEX are the extended solution to cold feet. With wireless control, these battery-powered insoles easily slip into your own boots or shoes. The wireless remote control lets you choose your desired heat setting.
Remote controlled . No need to take off your shoews to change temperature.
3 heat settings: medium heat (100° F), high heat (111° F), and no heat
Rechargeable, removable batteries (2 included)
Battery charges in 4 hours using wall charger or any USB port
Charge lasts up to 5 hours
Batteries are easy to change without removing insole from boot or shoe
Sizes:S(3.5 to 5) M(5.5 to 7), L(7.5 to 9), XL(9.5 to 11), 2XL(11.5-13).