Features

1.Made of high-quality flannel composite fabric, it is light, soft and
comfortable, with good thermal insulation and long service life.

2.As a necessary warming artifact in winter, it heats at a constant
temperature (50-60℃) to bring comfortable warmth to your feet in cold
weather and drive away the cold. 
3.Universal USB interface, compatible with a variety of charging
devices, such as adapters, mobile power supplies, car USB interfaces,
computers, etc.
4.The portable foot-warming bag is easy to operate, and can be used by
connecting USB interface, without charging or self-provided batteries,
which is more environment-friendly.