USB rechargeable heated insole: The heated insole adopts new heating technology, made of comfortable and comfortable EVA elastic material, with good cushioning, portable and lightweight, the heater is comfortable USB interface is heated by USB cable,the heating surface is large, the heat is evenly distributed, the temperature Up to 42C/108C. Cleanable and rechargeable use: This USB insole material is waterproof, washable and reusable, can be washed with a brush, not machine washable, it should be noted that it needs to be dried after washing, and must be completely dried before use . DIY Adjustable Insole Size: The electric insole can be cut to the size you need and can be adjusted to your shoe size, the shoe size range is given on the insole, it is convenient for you to DIY, the heated insole is 5mm thick, you don't have to worryabout the size, the insole Lines are marked on it for easy trimming. Fits men and women in US sizes 5-11. Versatile and Best Gift Heated insoles keep your feet warm in the cold winter, the temperature will reach 42 C/108, so wherever you go, you can stay warm, suitable for skiing and outdoor sports, other sports, Camping, housework, hunting, hiking, fishing,etc. make the best Christmas gift.