Upper material: indoor shoes kids and girls' fabrics are made of flying woven mesh fabric, which is breathable and light, suitable for spring, summer, autumn and winter. Inside material: Boys and girls sports shoes are made of textile and breathable materials, allowing children to wear comfortably and relax. Sole: The soles of boys and children's sports shoes are made of non-slip materials, which are non-slip, wear-resistant, shock-resistant, lightweight and comfortable. Closure: easy to put on and take off, to prevent the problem of loosening or tripping during exercise. Heel shape: please refer to the size chart before placing an order! Inner length = foot length + (5-10mm)