Decathlon | Size 4 Machine-Stitched Football Training Ball - White

Need a ball for your football club? With this F100 ball, go for a durableouter material that's ideal for your footballers' first steps in football. **Key benefits:** * Durability: TPU outer cover for good durability. * Lasting air retention: Optimised bladder for good air retention. * Bounce: The ball meets international football standards in terms of bounce.**Technical information:**The story behind this ball: It's important that young footballers use a ballthat's the right size, no matter their age, which is why our design teams havedeveloped the F100. Size 4 between 9 and 12 years. Size 5 for over 12 yearolds. In addition, we have conducted numerous lab and field tests to guaranteethe ball's ability to withstand every hit. ; Too light? Too heavy? The weightis standardised...: Between 410 and 450g (Size 5)Between 350 and 390g (Size 4); How big is it? What's the circumference?: Between 68 and 70 cm (size5).Between 63.5 and 66 cm (Size 4). ; A "round" ball?: Average measuredvariation: maximum of 1.8%. We measure the football's sphericity at 4500different points and then examine any differences. If the discrepancy isgreater than 1.8% (FIFA Basic Standard), our engineers are tasked withimproving the sphericity to ensure a consistent bounce. ; Maximum pressureloss test: here's what we do...: We inflate the ball to the recommendedpressure (meaning 0.8 bar). 72 hours later, the ball must not lose more than15% of its pressure, meaning approx. 0.1 bar. The pressure after 72 hoursmust, therefore, be at approx. 0.7 bar. This also means that it is quitenormal for a ball to lose pressure after a few days.