Popular Connect 19 Adidas soccer ball size 3 This size is perfect for preschool children to lower elementary school students. It uses a butyl tube that prevents air leakage, making it suitable for use on hard dirt grounds. The sand-resistant valve has a slit with a sand intrusion prevention mechanism at the air injection needle insertion point, minimizing air leaks. Manufacturer: Adidas Product Name: Connect 19 Glider Color: Yellow & Pink Material: Sewn, artificial leather Sand-resistant valve Size: Soccer ball size 3 Overall, there is dirt and some air leakage due to use.