The outer casing of a soccer ball is composed of panels made from synthetic materials, such as PVC, PU, or a combination, sewn or glued together. Soccer ball casings are rarely leather anymore, since leather tends to absorb moisture making the ball heavier and not perform as well. The number of panels or sections of the outer casing varies according to design. Most professional soccer balls are the 32-panel design. More panels mean a rounder and stabler ball, and a more accurate flight.

On the other hand, replicas (sometimes called training balls or gliders) are designed to be just like the official match balls but are much cheaper. Their panels are often stitched rather than thermally-bonded and are made of a different material. However, they’re not necessarily less durable than official match balls. So, they’re the recommended option for most players. https://www.youtube.com/watch?v=j2Xn84L3Kcs
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