DIY Adjustable Insole Size - Electric insoles can be cut to your desired size and adjusted to fit your shoe size. The shoe size range is indicated on the insoles for DIY convenience. Heated insoles are 4mm thick so you don't have to worry about the size, there are lines marked on the insoles that are easy to trim. Suitable for men and women of EU size 41-46. Wide range of applications and the best gift - The heated shoe insoles keep your feet warm in the cold winter, the temperature reaches up to 40-50 C (depending on changes in the ambient temperature), so no matter where you go can keep you warm for skiing and outdoor sports, other sports, camping, housework, hunting, hiking, fishing, etc., is the best Christmas gift. Cleanable and repeatable use - This USB insole material has a waterproof effect, is washable and reusable. You can wash it with a brush, not machine wash. It should be noted that it must be dried after washing and must be completely dried before use. Warm Reminder - Prepare an additional pair of insoles for replacement and cleaning, which has a positive effect on the lifespan of the insoles.