Obviously, the size of a football won’t really matter if you are just interested in having a kick about on the school playground or in the car park during your lunch break. The reason for having a smaller and lighter ball is to help players who are younger and still learning the game. A smaller ball will help with your overall technique, but it also helps youngsters who are still growing in terms of weight, height and strength.
A size 4 ball should weigh between 350g - 390g, with a circumference of 63.5cm - 66cm. The pressure will vary according to the type of materials and style of construction and is usually featured somewhere on the ball or on the packaging. They’re generally used in schools and youth leagues, up to the age of fourteen although, depending on where you play, the ages can vary.
Smaller balls are generally used throughout indoor football. For example, the Mitre Tempest Futsal Football is a size 4 ball aimed specifically at those players who prefer the small-sided game. The ball is constructed from a much more hard-wearing material because it is likely to be used on a hard or rough surface. The ball is also produced in such a way as to reduce the amount of rebound.
Many size 4 balls are produced to the same high quality at the size 5 match ball. They are usually filled with a high air retention bladder in order to retain a correct shape and maintain its pressure. Nike has produced a size 4 ball, the FootballX Strike Football, which is aimed at players who like to use hard surfaces or concrete.
A size 4 ball is incredibly useful to own. It is ideal for indoor or small-sided games but also works well as a training ball to help with your skills and control, before moving up to the full size 5 ball.