Club soccer ball Machine-stitched construction for high durability Butyl bladder for best air retention Size 5 ball (official size) suggested for ages 12+ Requires inflation ...

In this study, Nauman’s lab tested three soccer ball sizes – a 4, 4.5 and a 5 – by kicking them against a force plate in a lab. Even though only size 5 balls are played by professional adults, the ...