Lovely, children's crocs are made of foam material. They are light and comfortable, and also have holes in the upper that facilitate the ventilation of the footwear. Perfect for playing in the garden, pool or beach. In addition, the crocs have a strap holding the foot against sliding. When choosing a size, please refer to the size chart. 19-12/20-12,5/21-13/22-13,5/23-14,5/24-15/25-15,5/26-16/27-17/28-17,5/29-18/30-18,5/31-19/32-20/33-20,5/34-21/35-22cm