Super-Soft Plush Material: USB Electric Heating Slippers are constructed from super soft plush flannel. The flannel material is sheer comforting indulgence. Please note that for safety concerns, there are heating wires only at the bottom. The inside soft plush adds extraordinary comfort to your feet. Electric Foot Warmer: Electric heated foot warmer uses the latest heating technology. Providing efficient relief from tension, stiffness, soreness, and cramps. This foot warmer heats up in a few minutes to provide fast relief to cold feet and aching muscles. Protect your feet from low blood circulation, arthritis, and cold floors. Waterproof and non-slip at the bottom: You can wear the plush warm slippers and go into the washroom without changing shoes. In the outdoor dry environment, the portable power source can be adopted as an adapter for the power supply. With the working voltage of 5 V, safety to use. just plug it into the pc and notebook USB port, power bank. Or a USB adaptor(such as a cellphone adaptor). Indoor Foot Warmers: It is enough to put your feet. It will provide a safe warm nest while sitting in a recliner chair or lying in bed. you can enjoy anything, like listing to music, watching TV or playing games with your friends in cold winter.