If a player wanted to wear a Guardian Cap during a game, the league would prohibit it - NBC Sports
Florio] Joe Burrow, who has no official history of concussions but who has admitted playing with head injuries, switches to the new position-specific helmet aimed at better protecting the brain. : r/nfl
Leatherhead to Radio-head: The Evolution of the Football Helmet, Arts & Culture
Can the Q-Collar Save Football From Its Concussion Problem? - InsideHook
First QB helmet designed to help reduce concussions approved
First QB-specific helmet designed to help reduce concussions approved
NFL Reveals New Quarterback-Specific Helmet To Help Combat Head Injury - The Sports Credential
What Pros Wear: Top 5 Helmets Rated by the NFL & NFLPA - What Pros Wear
NFL and players union announce new quarterback-specific helmet to combat concussions
First QB helmet designed to help reduce concussions approved
Kirk Cousins spotted wearing a fancy new helmet at OTAs
The NFL Is Using Sensor-Laden Mouthpieces to Study Concussions
First QB Helmet Designed To Help Reduce Concussions Approved