You may be worried because you feel it sells too expensive but this is not the case. With all these great features, the ball still ranks as an affordable ball. It features a machine-stitched construction with internal nylon wound carcass that ensures maximum durability and long-term performance. Further, the TPU material used on the exterior will resist abrasion, and the butyl bladder provides best air retention to keep it in shape and remain inflated for a long time.
If you are unsure of which size to get your child, I will recommend what size I think based off real-world use. The size 3 is good for any child until about first grade or second grade, which is when a child should move into a size 4. The size 4 should last until they get to middle school (around 6th or 7th grade), and then they would move into the adult official size 5.
Size 5 is the official size for professional matches. Therefore, this ball is only available in this size. Do not use this soccer ball on concreted areas. Its unique rubber uses Puma Airlock Valve Technology (PAL) in order to facilitate proper airlock technology. This ball features Perimeter Balance Technology (PBT) which enables it to maintain impressive flight characteristics. https://www.youtube.com/watch?v=j2Xn84L3Kcs