American football is a fierce confrontational contact sport. Due to the violent collision in the game, the players must wear armor-like protective gears. These protective gears mainly include helmets and shoulder pads with cage masks, and chest protectors. As one of the upper body armor, in addition, according to the league level will also include mouth guards, gloves and cover the elbows, waist, buttocks, shins, thighs, knee pad and so on.
According to statistics, the use of protective gear can reduce the probability of serious injuries by more than half. Nevertheless, the fierce nature of American football still makes it difficult to avoid injuries, in which concussions caused by the blunt force of physical impacts are particularly common and there are several each year. Ten thousand players were injured.