adidas Performance F50 X-ite II Soccer Ball Outer: Machine-stitched construction for soft touch and high durability. Bladder: Butyl bladder for best air retention. TPU cover with nylon-wound carcass to ensure high durability and soft touch. F50 panel shape offers a striking look and optimal roundness Machine-stitched construction for true ball roundness. 100% thermoplastic polyurethane.