Indoor slippers, with the improvement of people's quality of life, are getting closer to people's lives. Indoor slippers are generally divided into cotton slippers, open slippers, bathroom slippers, slimming slippers, fitness slippers, floor slippers, disposable slippers (hotel slippers) and so on. As the name implies, no matter what kind of indoor slippers, they are mainly used in the room. The characteristics of convenience, hygiene, warmth and comfort make indoor slippers gradually become an indispensable item in people's lives. The so-called usb slippers are slippers with built-in usb heating pieces. This kind of slipper mainly refers to the sheet heated by computer usb port power supply. Some people also call usb heating film heating film, heating film or electric heating film. Slippers with built-in usb heater are generally suitable for wearing in cold winter.