When it comes to keeping children's feet dry and warm, you should take a look at the Southpole 4. Both the upper material and the flexible outer shell are waterproof, providing excellent protection against moisture, along with sealed seams. The thermal properties come from the interchangeable 6 mm thick Zylex insole with moisture-absorbing inner lining. Kamik's patented Zylex technology is the ultimate innovation for outstanding heat and moisture management. The revolutionary three-layer design wicks sweat away from the feet while keeping body heat inside and cold out. With additionally reinforced seams and heel protection, long durability is ensured. For size adjustment, there is a bungee closure around the midfoot, and the snow collar can also be adjusted with a bungee closure.