• Waterproof design: washable and reusable insoles with waterproof materials. They can be cleaned with water or a brush, but not in a washing machine. Make sure they are completely dry before using them and keep the USB port away from water. • Safe and efficient: USB heated insoles that keep your feet warm in winter. They operate with a power of 5 V 2 A, offering a safe low voltage and energy saving. They distribute heat evenly with temperatures between 40 °C and 50 °C. • Comfortable materials: made with elastic EVA fiber and carbon fiber material, they offer high resistance to slipping and high temperatures. They are soft to keep your feet comfortable and warm, ideal for outdoor activities. • Adjustable size: customize the size of the insoles by trimming according to the marked lines. Suitable for EU sizes 35-45, both for men and women. • Versatile: perfect for skiing, snowboarding, outdoor cycling, working in the cold, or drying wet shoes. They prevent cold feet on cold days.