Baseball cap is developed together with baseball, which is a kind of ball game with baseball as the main characteristic, collectiveness and antagonism. It is widely carried out in the international arena and has a great impact. It is known as "the combination of competition and wisdom". In the United States, Japan is particularly popular, known as the "national ball." Baseball's influence was so great that the cap was popular with the sport. According to American experts who have examined the sport for years, it is thought that it originated from the English Cricket called Rounder. In 1839, Doubleday, an American, organized the first games to resemble modern baseball. At the beginning of the game, players wore hats to cover their eyes from the sun. Due to their particularity, the brim of the hat was long enough to cover their eyes from the sun so as to get better results. This was the earliest baseball cap.