USB Electric Heated Insoles Winter Comfortable Keeping Feet Warm Washable Outdoor Sports Thermal Shoe Pads Mat UnisexFeature: High conversion efficiency, energy saving, half an hour of current. It's easy to cut to the size you need. Suitable for all types of shoes. Make your feet comfortable and warm. The design is readable, comfortable and clean. USB charger, to computer, notebook, charger, keep your feet hot inside. Specification: Size: 35-40, 41-45Color: BlackMaterial: Carbon FiberFunction: Keeping Foot WarmMaximum Voltage: 6vHeating Range: Full HeatingPackage Includes: 2 Electric Heating Insoles, 1 USB CableNote: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. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. 2 X Electric Insoles1 X USB Cable