Children's sandals are made of patterned foam material. This model is extremely light and comfortable to use. The sandals are fastened with Velcro, which allows you to adjust the shoes to the length of the foot. This model is built on a fine platform. When choosing a size, refer to the size chart.23-13/24-14/25-14,5/26-15,5/27-16/28-16,5/29-17cm