Heated Insoles: The heated insoles are made of premium soft heated insoles, with carbon fiber heating wire, the preheating system warms up slowly and evenly.USB heating interface: insert the insoles into your shoes and connect them to the power supply to enjoy the warmth. Rubber heating element, large heating area, even heat distribution, never again cold feet.Safe and reliable: environmental protection, low voltage, safe and energy efficient. The heating time depends on the choice of battery. For better heating function, we recommend using batteries from 2000 mAh. Stable heating, guaranteed safety.Washable Reusable: heated insoles can be cleaned. Dry before use. You can clean it with water for recycling, but keep the interface away from water when connecting USB power.Application areas: USB shoes for men and women, for skiing and other snow sports. Army, police and rescue personnel, against the cold in the house, outdoor cycling, cold outdoor work. Ideal for all types of shoes and boots.