Perfect, winter children's shoes from the Big Star collection. The upper for the ankle is made of synthetic material. In addition, these boots have a Memory Foam System insert that remembers the shape of the foot, which ensures a perfect fit, absorbs shocks and is resistant to deformation. The structure of the foam allows moisture to evaporate and the temperature to be regulated. The boots also have a slightly stiffened heel. The rubber sole is non-slip. When choosing a size, please use the size chart. 28-18/29-18,5/30-19,5/31-20/32-21/33-21,5/34-22,5/35-23 cm.