Only one week after Cochrane's injury, on June 1, 1937, the Cleveland Indians and Philadelphia Athletics became the first teams to test helmets, using leather and polo helmets respectively. Managers of both teams decided to use batting practice as a test run for helmet use on their players, before a game between the two teams. Though there is picture evidence of the polo helmets being worn in batting practice, there is no evidence of their being used or worn in a game. The first documented team to wear helmets in a game was the Des Moines Demons of the Western League. They also used polo helmets but the idea did not stick, as they only wore the helmets for one game.