NFL releases warning on use of proper helmets (this means you, Antonio Brown)

It doesn’t sound like the NFL will cave on their helmet battle with Raiders star Antonio Brown. 

The NFL’s public relations czar sent out a reminder on social media that players cannot practice or play in games with equipment that’s not approved by the league (Twitter link). 

Furthermore, if a player in that scenario does not play or practice, said player (read: Brown) will be in breach of his contract and will not get paid.