During official American football competitions, all national, European and international teams must play with a leather ball in accordance with the rules of the game imposed by the NCAA, EFAF, IFAF rules for American football and flag football. Depending on the age category, the size of the balls may be different to simply adapt to the size of the hands of Quarterbacks, Receivers, Running backs, Defensive backs ... So don't forget to get in touch with your clubs and national federations to find out which ball size is the right one. In France, for example, Seniors and Juniors play with the official size, while women and cadets play with the YOUTH size (Wilson GST TDY, Wilson TDY, Baden, Nike, Adidas, Spalding, ...).