Get warm feet with this heated foot bed by the Heat Factory! Just the thing for those extra cold days. The heated foot beds can be used in an everyday shoe or boot and they're transferable from boot to boot. The cavity under the toes is designed to hold Heat Factory Footwarmers. The foot beds are easy to fit and all you need to do is remove your existing foot beds in your boot, trim the heated foot beds to the same size from your boots for proper sizing and put them in.