What must all legal helmets have labeled on them?

All legal helmets used in high school football must have a label indicating compliance with the NOCSAE standards. NOCSAE, which stands for the National Operating Committee on Standards for Athletic Equipment, establishes performance standards for helmets to ensure they adequately protect players from head injuries. This label signifies that the helmet has gone through rigorous testing and meets safety protocols, thus providing a level of assurance that the helmet is designed to reduce the risk of concussions and other head-related injuries during play.

The other labels mentioned may apply to different contexts or sports but do not serve the same purpose in terms of football helmet safety standards. For instance, ANSI refers to standards set by the American National Standards Institute, which may apply to various safety equipment but not specifically for football helmets. FIFA represents the international governing body for soccer and pertains to soccer equipment, while the NFL denotes the National Football League, which is a professional level and does not regulate high school football helmets.