2. The Ball - Throughout the time, the rules for soccer regarding the football remained the same, but the way in which they were applied was on a constant change. The rules state that the soccer bull must have a circumference between 68 and 70 centimeters and a weight between 410 and 450 grams but they also state that the ball can be made out of "leather or any similar material".
Well that "any similar material" bit constantly improved over time and nowadays soccer balls reached near-perfection. Almost each World Cup brought a new type of soccer ball, with improved characteristics, although all of them stayed inside the official soccer rules stated in the Laws.
