7. When you are buying online this is easier, because you have ratings and comments on many stores out there. It is good to look at top rated soccer balls or best selling soccer balls. Another good source to do is by visiting soccer forums where people talk about different things and there can be also a board/post about soccer balls, what they think, their experience etc.
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