Features 1. Cuttable Size: DIY heated insoles you can cut Electric Heated Insoles to your own size according to your needs. Suitable for men and women from 230-250 mm size or 255-275 mm. Ideal for all kinds of shoes. 2. Lasting Foot Warmer: Heated insoles use of far infrared carbon fiber can promote blood circulation in the feet, large heating surface, even heat distribution. The highest designed temperature is 50/122 F. 3. Cleanable and Reusable: Heated insoles are eco-friendly and can be used repeatedly, be careful not to machine wash & Be sure to dry thoroughly before use. 4. USB Charger: Portable rechargeable heated insoles, light and elastic, include a portable USB Connector with long cables to charge via power bank, laptop, plug adapter and any devices with USB port. 5. Wide Range of Uses: Heated insoles efficiently prevent your feet from cold and against the cold in the household/ cold outdoor. Perfect for outdoor activities hiking/ skiing/ hunting/ fishing/ camping etc. Specification Material: EVA Color: Black Size: 35-39(230 mm-250 mm), 40-44(255 mm-275 mm) Weight: 150 g Constant temperature: 50 Package Include: 1 Pair Heated Insoles 1 USB Charger