Quality Materials - EVA elastic fiber material, keep your feet warm and warm enough, will not hinder your movement when hot, great for all outdoor activities. Adjustable Shoe Size - These insoles can be cut to your size. According to the free cut line, the insole can be cut to suit your shoes. It fits most EU41-45 shoes. Easy to use - 5V, 2A power supply, Three heating modes: USB interface, power adapter and power bank. Just put on your shoes and turn on the power to enjoy the heat. Easy to clean - The heated insoles can be cleaned. Dry it before use. You can clean it with water for recycling purpose (not for machine washing), but keep the interface away from water when plugging in the USB power. Perfect For Winter - Outdoor Electric Heated Insoles, Ideal For All Kinds Of Outdoor Activities Like Running, Fishing, Hiking, Skiing, Motorcycling, Hunting, Climbing, running, sledding, etc. They can promote blood circulation, relieve stiffness in outdoor sports even in a harsh winter! Product description Specification: Item Type: USB Insoles Material: elastic EVA fiber Color: black Temperature: approx. 40-50 Voltage: 5V / 2A Size: 41-45 Features These insoles can be adapted to fit almost any shoe or boot size. Three heating modes: USB interface, AC adapter and power bank. Easy to use, just insert the shoes and connect the power to enjoy the heat. Take a water repellent material that can be washed directly. More comfortable and cleaner. Package contents 1 x pair of heated insoles Attention! 1.Unplug the power cord when not in use; 2. The heating soles can be cleaned, ensure drying before use. 3. The elderly and children should be used under guardianship.