Description: 【High-quality material】It features soft and comfortable EVA stretch material, Light, and with good cushioning. evenly distributes heat to the substrate surface. Insole fabric EVA elastic fiber + heating material far-infrared carbon fiber, suitable for a variety of outdoor activities. 【Fast Warmth】 40-55 degrees high temperature heating protects your feet from cold winters, PLEASE NOTE: The insole does not store electricity and NEEDS TO BE CONNECTED ALL THE TIME. 3 heating modes: USB interface; Power adapter; Power bank. Please purchase the power bank with output voltage of 5 volts 2 amps (NOT contain power bank, please check the parameter information on the back of the power bank you used). 【Cuttable Size】The heating sole can be cut and shaped, 4 mm thick and is suitable for men and women. According to the line, you can cut the insole according to your shoes. Suitable for most shoes. 【Waterproof Design】 Washable and reusable. The materials we use are waterproof. Can be washed directly without affecting the effect of use. You can also clean with a brush (not for machine wash). Need to be completely dry before use. 【Areas of application】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. Specification: Material: EVA Size(35-39): length:250mm / 9.8inch Size(40-44): length:275mm / 10.8inch Thickness: 4mm / 0.16inch Package Includes: 2 Pair USB Heated Shoe Insoles