Slide the Therm-ic ThermicSole Classic into your ski boot and say good-bye to ending the day early due to cold toes. This classic heating kit includes two heating elements, already attached to a footbed, so there's no installment to fuss with. The insoles can be trimmed down to fit your boots, and ensure a dry, breathable climate for your feet. Simply plug them into the SmartPack battery (sold separately), and you're good to go.