The adidas Conext 26 League Football, White, Black, and Orange, KE5865, is perfect for training and competitive matches on natural surfaces. It features a standard, seamless construction. The Thermo Seamless Bonding outer shell provides a smooth, durable, and waterproof surface. A butyl bladder ensures a smooth, durable, and water-resistant surface. Technical data: Cover: 100% recycled polyurethane The size 5 ball is FIFA Quality Certified The size 4 ball is not certified.