Wondering how you got stuck working in a polar vortex? Warm yourself from the ground up with ThermaCell heated insoles. These high-tech toe warmers have a built-in thermostat and operate by remote control, so you can adjust the heat or turn the insoles off with the touch of a button and without removing your boots. Integrated rechargeable lithium-ion batteries allow for more than 500 charges that last five hours at a time. At $129.99 a pair, that works out to about a nickel per hour of use.
ThermaCell heated insoles are available in five sizes to accommodate shoe sizes ranging from a woman's size 6 up to a man's size 13. ThermaCell | thermacell.com