Easy to use
Use Carbon-fibre as the heating materials, which can offer you the most comfortable temperature . This item can keep your feet dry .It has anti-bacterial function

Key Specifications/Special Features:

• Usb heating insole with warmer, keeps feet dry and
  comfortable in winter
• Uses carbon-fiber as the heating materials, offering you the most comfortable temperature
• Can provide any size and color
• Temperature: 36-42℃