Oakland Raiders wide receiver Antonio Brown has threatened to retire unless he's allowed to wear his old helmet, according to ESPN's Adam Schefter.
The reporter explained the helmet dilemma:
"The helmet that Brown is comfortable in and has worn throughout his career with the Pittsburgh Steelers --believed to be the Schutt Air Advantage helmet, which the company has discontinued making -- is no longer certified by the National Operating Committee for Standards and Athletic Equipment (NOCSAE).
"The NFL has a policy of not allowing players to wear helmets that are not certified by NOCSAE.