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.

I decided to try to contact Kan Jam, since I was more interested in the possibility of an exchange than a return. In my experience, if a company will honor an exchange, some of the time, they won't require that you send the original product back. But I couldn't find any direct contact info for Kan Jam and decided to just open up a Return Request through Amazon. I did say in the comments that I would prefer an exchange over a return, but I


Match balls are constructed specifically for competition and the sport's high-level training. These balls feature higher quality materials and must conform to regulation standards of your league. Training and recreational soccer balls are designed to handle extended use on a variety of playing surfaces, often featuring a PVA casing for enhanced durability.
Differing from competing balls that utilize plastic, the deluxe cushioned cover of the Mikasa Serious Soccer Ball is made of synthetic leather. This soft, durable material is exponentially easier on the shins and foreheads of players used to batting the ball around regularly. The leather is forgiving in its impact, allowing passes and shooting to be crisper off of the athlete’s foot.
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
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