Features: Long Lasting: Battery-powered heated insoles for warmth in cold weather Adjustables: Adjustables settings for personalized comfort Wireless: Lightweight and wireless design for comfort and convenience Wide Application: Ideal for skiing, hiking, camping, and outdoor activities in winter Easy to use: Simply remove your old insoles from your shoes or boots and aligns them with your new Heated Insoles to compare sizes and determine if any trimming will be necessary. 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Material: Plastic+carbon fiber Charging voltage: 5V1A Charging current: 400mA 7.4WH Battery capacity: 2000mAh Load impedance: 8 ohms Heating cloth: 10*6cm 3 temperature settings: High: 55 degrees, use time: 4 hours Medium: 50 degrees, use time: 6 hours Low: 40 degrees, use time: 9 hours Size: Large size: suitable for shoe size of 41-46 Small size: suitable for shoe size of 35-40