USB Electric Heated Insoles Winter Comfortable Foot Keeping Warm Washable Outdoor Sports Thermal Shoe Insoles Mat UnisexFeature: High conversion efficiency, energy saving, half hour electricity. Easy to cut to the size you need. Suitable for all kinds of shoes. Make your feet comfortable and warm. The design is clear, convenient and clean. USB charger, connect to computer, notebook, charger, keep your feet inside. Specification:Size: 35-40, 41-46Color: BlackMaterial: Carbon Fiber Function: Keep Your Foot Warm Max Voltage: 6v Heating Range: Full Palm Heating Package Includes: 2 Electric Heated Insoles, 1 USB Cable Specifications: USB, US, EUNote:Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Please allow 1-2cm measurement deviation due to manual measurement.2 X Electrical Inserts1 X USB Cable.</img