High-quality material - Heated insoles adopt new heating technology It features soft and comfortable EVA stretch material,Light, elastic and with good cushioning. Keep your feet warm in winter for optimum blood circulation in feet. temperature reach up to 108 / 42C. Cuttable Size - Electric insoles can be cut into your need size, adjustable to your shoe size , the shoe size range is given on the insoles for your DIY convenience, heated insoles is 5 mm thick, you don't have to worry about the size, there are lines marked out on the insoles, easy to trim.suitable for men and women from size 8-11/41-45. USB Heated Insole - Large heating surface, even heat distribution. The heater is comfortable with interface. The heating sole is used for heating via the USB cable. so no matter where you go, you can keep you feet warm. Cleanable & Repeatable - This insoles material has a waterproof effect, is washable and reuseable, you can wash it via brush, not for machine washing, it should be noted that it needs to be dried after washing, and must be completely dried before use. Wide Range of Uses & Best Gift - Perfect for outdoor activities skiing, hiking, fishing, cycling, hunting to prevent your feet from cold. Against the cold in the household, outdoor cycling or work in the cold outdoors. is best christmas gift.