Therm-ic SmartPack IC 950 Classic Set

As your feet get colder, they hurt more (duh) but they also don't perform as well. Therm-ic's SmartPack IC 950 Classic Set uses a rechargeable lithium-ion battery that connects to the included Classic insoles to keep your toes toasty and working their best. It charges quickly, letting you choose between three heat levels via the control panel display, and it continuously radiates heat through the insoles to keep your feet limber, strong, and feeling good. The insoles themselves are designed to fit inside any boot and can be easily trimmed to the right size with a regular old pair of scissors, so you don't need to spend hours at the bootfitter to get your boots fitting well again.