By no means is this type of ball similar to a typical soccer ball. For starters, instead of air, its bladder is filled with foam. In this case, the ball has less bounce and is heavier in order to facilitate its purpose; meant to be used on a hard surface indoors. This size 4 ball may also have suede castings which help to stabilize the ball on a slippery floor.
This can be used as a great option for goalkeeper training as well. Why? Look, you can hardly see the lines on this ball, hence you won’t be able to guess the direction by only seeing the spin of the ball. That means as a goalkeeper you will have to give full concentration to detect the direction of the sliding balls. This is obviously helpful if you are a goalkeeper, and looking for a sliding challenge.
Update (2 years post-purchase): Still love this ball and it's in its fifth season of use! I've just ordered another for our team since the fall season makes for darker and darker practices on our unlighted scrimmage field and we've come to rely on this ball so much. My teenagers use this ball at home all the time, including playing "soccer tennis" on hard surfaces and for banging against a brick wall (all of the print is long gone from the outer surface). We even took it to the beach this year. It never fails to get a reaction from people who see it bouncing around in the dark. I did have to replace one of the two lights, but they're available from GlowCity and are very reasonably priced (I purchased a couple of extra lights, just in case). I also bought a pack of 100
A quick inspection of the construction of the ball might help you make a quick decision. The first thing that you should look at is the panel of the ball. A soccer ball that has panels sewn together is a better choice than the ones that are glued together. The panels of a premium ball are stitched by hand while those of a lower quality are machine stitched.
Voit goes a way back since its foundation in 1922 in providing the best soccer balls to all soccer fans and professional players. By the end of the 1920, the company introduced the first fully molded rubber soccer ball. They also came with the needle like air retention valves. They later invented a technology that allowed the balls to be machine wound with sturdy nylon threads over the rubber bladder. This ensured that the soccer balls would be stronger and more consistent. It also made balls cheaper and more available since they can be produced in mass production.
The flight of the ball is accurate to the type of kick that put it into motion because of the 12 panels pieced together flawlessly. The Aerowtrac grooves allow the ball to soar through the air swiftly. The interior bladder is restricted to produce a healthy sphere full of air. The shape is retained even through heavy use and harsh playing conditions.
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 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 size five blue soccer ball is an updated classic ball with a traditional 32-panel machine stitched design and a fun, colorful look. It is a great soccer ball for training and comes with a long-lasting air retention bladder that helps reduce deflation. The Pro Trainer new soccer ball has a durable cover with counter balanced graphics. Franklin Sports is a reputable company with years of experience making the best soccer equipment, and you’ll undoubtedly want to purchase one of their soccer balls if you want to train and play like a pro.
Latex bladders are one of the best materials when it comes to ball construction. However, with latex bladders, air won’t last as long as butyl bladders and will need more attention for proper inflation. Butyl-blend bladders hold in the air much better, but they are harder and less receptive in play. Mid-priced balls will usually have a mix of butyl and rubber. https://www.youtube.com/watch?v=c1SVcjYY6TE
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