Why do some soccer balls get bigger over time?  Many soccer balls do tend to get larger over time. Especially lower quality balls! This is due to the pressure of the bladder against the linings and cover.  Over time the material and stitching may stretch out causing the ball to become larger. Also, soccer ball abuse may cause the stitching to loosen and the ball to expand.
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
The Desafio 395 new soccer ball has UA TOUCHSKIN Technology that helps deliver a soft touch and an excellent feel when handling the ball. It is made of PU exterior material that is great for power transfer. Besides, the ball has an SBR Foam layer that adds softness for improved performance while the high rebound rubber bladder ensures excellent control and touch of the ball. It can be bought in two different sizes and selecting the best color depends on your personal preference.
A tribute to one of the richest teams in the world, Paris St. Germain, this ball is dressed in their colors.  This is a ball meant for everyday use, so you can get out there and show off your favorite club to everyone.  It is made from polyurethane and has some polyester inside of it, making it slightly different than the Messi ball.  The polyester buttresses the butyl bladder, causing it to retain air and shape.  It is machine stitched and has 26 panels, so it may take a little bit of getting used to the first time.  Like the Messi ball, it comes at a pretty steep price, so it may be a little pricey if you aren’t a PSG fan!
Why do I always have to pump up even expensive balls? Many balls use bladders made out of latex. Natural Latex Rubber bladders offer the softest feel and response, but do not provide the best air retention. Micro pores slowly let air escape. Balls with natural rubber bladders need to be re-inflated more often than balls with butyl bladders. Even after one or two days, the latex bladder will leak enough air so that you will have to inflate the ball back to recommended pressure. Some balls use carbon-latex bladders in which the carbon powder helps to close the micro pores. Soccer balls with carbon latex bladders usually increase air retention to approximately one week. Of course, check the ball for punctures that may cause the air to leak out.
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.
This Superlative Match Soccer Ball was truly designed with the player in mind. It ensures excellent touch and trajectory and would be the best ball for players looking to improve their soccer skills and play like pros. It has a compression-balanced latex bladder and aero-textured microfiber shell that delivers smooth ball handling on the field while equally ensuring accurate control over its flight path through the air. It is hand-stitched and thermal bonded making it very durable and the most powerful soccer ball on the market. The GOLME soccer ball has bright neon and luminous pearl hues to give it a blood design that makes it look quite elegant and also improve your performance on the pitch.
With 32 machine stitched panels, the American Challenge Brasilia comes together to create a soccer ball that has a beautiful, shiny outer casing. 4 color choices include Lemon, Lime, Orange, and Raspberry. The design on each ball is elegant without being distracting, and its surface is resistant to scrapes and scratches that ruin the aesthetic appeal.

Whereas plenty of manufacturers that we reviewed opted to go with a soccer ball that was more durable than responsive, Mikasa takes the opposite approach and focuses primarily on the touch that their ball can provide. This is most apparent in the soccer ball’s choice of casing material. The synthetic leather casing of the Mikasa is by far the softest and naturally responsive-without the inclusion of texture-out of any other soccer ball we reviewed. https://www.youtube.com/watch?v=3OKagE2ZIRA

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