Nike keeps you on the top of your game with the Strike soccer ball. This brand is a member of the Sustainable Apparel Coalition. Specialized ball designed for recreation and training. Premium polyurethane casing in a 12-panel design. Bonded construction provides a consistent touch with added durability. Butyl bladder keeps its shape. Nike Aerowtrac grooves stabilizes ball flight. 2-year, Nike stitch and shape warranty to ensure continuous high quality. Sizing Size 5 Ages 12 and up Size 4 Ages 8-12 Size 3 Ages 8 and under 65 rubber, 15 polyurethane, 13 polyester, 7 EVA. Imported.