To be honest, this ball’s a bit like a classic car, in that it’s awesome – when it works. The Jabulani is prone to valve issues, although they can be fixed. If you need something durable, we wouldn’t recommend this ball. However, if you’re looking to add an awesome ball to your collection – and you’ve got the cash – consider grabbing a Jabulani before they go extinct.
This 12-oz. ball works for players between 8 and 12 years old and has a circumference of 26 inches, larger than a size 3 and smaller than the size 5. This age group tends to play on a field of about 30 to 50 yards, writes Deborah W. Crisfield in "The Everything Kids' Soccer Book," with a goal size of around 6 feet high and 18 feet long. Again, the scale for the U12s falls between that of the U8s and that of the older age brackets for the No. 4 ball and the game as a whole. Some leagues may limit the No. 4 ball to U10s instead of U12s, so check league rules before making a purchase. 
At the World Cup level, these tiny changes in a ball’s aerodynamics can legitimately impact a team’s performance, so the intense scrutiny of the World Cup ball is perhaps to be expected. “You could argue that it’s the most important piece of equipment in the most popular sport in the world,” says John Eric Goff, Professor of Physics at University of Lynchburg.
New! 2018 FIFA® World Cup Russia Telstar Mechta Ball: Get your own official knockout stage ball, designed with a new red color to represent the host country. While the Telstar Mechta features an intensified look, it has the same high-quality construction as the Telstar 18 ball used in the group phase. Mechta means “dream” or “ambition” in Russian, honoring both players’ and fans’ FIFA World Cup ambitions.
Soccer — or football as it's known around the world — is arguably the most loved sport on Earth. Although Americans still aren't as enamored of the sport as the rest of the world is, teams around the country are stealing hearts and minds, and Americans are getting into the game. For years, soccer has been a sport played by kids, college students, and ex-pats, but it's now being cheered in stadiums and watched on national TV. https://www.youtube.com/watch?v=DGp37du0xbQ
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