What is a Guardian Cap? Meet the NFL's newest safety measure
In name of safety, Steelers debut astronaut-like helmet protective coverings at minicamp
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
Coverage of the NFL in Guardian Caps
Damar Hamlin and Sam Peltzman: Where Football Meets Economics - Econlib
Coverage of the NFL in Guardian Caps
Could Guardian Caps be used during NFL games for player safety?, Pro Football Talk
Coverage of the NFL in Guardian Caps
A closer look at the rule changes the NFL is debating - The Washington Post
A closer look at the rule changes the NFL is debating - The Washington Post
Seeking to reduce head contact, NFL mandates use of Guardian Cap helmet for early portion of training camp - ESPN
Could Guardian Caps be used during NFL games for player safety?, Pro Football Talk