adidas X Glider II Soccer Ball, Solar Red/Red/Black/White, 3 Part of the x soccer collection, perfect for daily drills, practice, and play Machine stitched construction and internal nylon wound carcass for maximum durability and long-lasting performance Special TPU exterior material is designed to resist abrasion and last longer Butyl bladder for best air retention to keep the ball's shape and stay inflated longer Size 3 ball suggested for ages 8 and under; size 4 ball suggested for ages 8-12; size 5 ball (official size) suggested for ages 12+. check with your local League for size requirements