They’re largely intended for ski boots, but I don’t see what would prevent you from slipping them into your everyday winter wear. Just attach the insole to the included battery pack, which hangs outside of your shoes and snag the wireless remote, which goes to
10. The battery charges in 30 minutes and lasts 10 hours. Available in men’s sizes 3-14 (apparently I’d need an XXLarge) and women’s sizes 4-11 for a scant $350. But when it comes to frostbite, is there any price too high?
SCI FI Tech