Only size 5, and size 4 are available for this. Although this should not be a major problem as this is for recreational play and practicing purpose, so kids are ok to play with this as well. In fact, the ball that will be given away to the developing countries will be used by the kids mostly. If you are buying this for an adult go for size 5, and if you are buying for kids or youth players then better go for size 4.
Elements of the football that today are tested are the deformation of the football when it is kicked or when the ball hits a surface. Two styles of footballs have been tested by the Sports Technology Research Group of Wolfson School of Mechanical and Manufacturing Engineering in Loughborough University; these two models are called the Basic FE model and the Developed FE model of the football. The basic model considered the ball as being a spherical shell with isotropic material properties. The developed model also utilised isotropic material properties but included an additional stiffer stitching seam region.
This is a decision being made by a league operator or manager of some sort, this section is important for you.  For the individual, there isn’t much of a determination here.  If you want something really nice like the pros, go premium.  But if not, then you probably will just want to go with a training ball.  But for people equipping their teams with materials, this is a decision that needs to be taken seriously.  I would suggest that recreational leagues stick with training match balls, even for matches.  The number of kicks that the ball will get and the improper technique will cause headaches for you if you decide to buy premium balls.  For high schools, I suggest just regular match balls as many are still learning the basics of the game and many teams simply play “kickball” at that age.  For college teams, semi-pros, serious travel clubs, and of course, professional teams, I suggest premium match balls for play!
This is what the majority of quality soccer balls are made out of. It offers a great blend of durability and responsiveness and is the material most commonly used by professional leagues for their game balls. In fact, FIFA uses polyurethane, or PU, exclusively for their game balls. One thing that allows PU to stand out above many of the other materials is its versatility.
This is what the majority of quality soccer balls are made out of. It offers a great blend of durability and responsiveness and is the material most commonly used by professional leagues for their game balls. In fact, FIFA uses polyurethane, or PU, exclusively for their game balls. One thing that allows PU to stand out above many of the other materials is its versatility.
When I buy a soccer ball at a local store, how do I know if I am buying a good soccer ball?  Ball material information on the packaging of the balls is minimal at best. Marketing hype is hard to understand. So people are very frustrated when buying soccer balls for their clubs, teams or own use. Parents of soccer players have always asked me about what type and where to buy soccer balls for their up and coming star. "Go to the local store and pick out one that is on sale" I would tell them. The only recommendation I could make was to check out soccer balls that I previously used and knew they were good quality. 
Another imprint you’ll find on your Adidas 2016 MLS Official Match Ball, is the FIFA quality seal. As you recall, the FIFA testing involves many aspects of testing in order to pass certification and earn this imprint. This ball passed in all categories including circumference, sphericity, rebound, water absorption, weight, loss of pressure, and shape/size retention.

These balls were add on items and they were a great price. I got four of them because I started coaching U8 soccer. I didn’t want to spend a lot of money on balls let me get ruined or actually find their way home with one of my players, these were a perfect fit. We are only halfway through the season and they’ve held up great, they’ve even used them as the game ball on a couple occasions. I would recommend this to any soccer coach.

Another type of soccer ball that some players may find to be useful is the indoor soccer ball. Indoor balls are designed to have less bounce and rebound to them, making it possible to control the ball on a tighter court or field. The cover of an indoor ball is also the strongest of any category, so it can withstand play on turn, hard court surfaces, and impacts with walls.
The Futsal ball is typically smaller, harder, and heavier, allowing for less bounce and better control on harder surfaces. Senda Athletics is the official ball partner of U.S. Youth Futsal and the Vitoria is the Official Ball of the USYF League. Accented with bright red or green and created with fair trade practices, its stamp of "Respect," "Joy," and "Community" expresses the company's philosophy.
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