Heat Factory separates itself from the competition in many ways. One of the biggest ways is through the sheer amount of foot warming options offered. Far more than anyone else in the industry! Not only does Heat Factory offer single use warmers for use in footwear, it also features quality socks and orthotic Foot Beds that accept Heat Factory Foot Warmers. Heat Factory’s Heated Footwear is designed with one goal in mind- keeping your feet out of the cold.