NFL exec suggests Guardian Caps worn to protect players during practices could one day debut in games
What's With Those Padded Caps NFL Players Are Wearing In Training Camp?
Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries
NFL offseason priorities for 2023: Possible rules changes, safety reforms - ESPN
The 2022 Uni Watch NFL Season Preview - by Paul Lukas
NFL players don Guardian Caps, designed to protect from concussion
NFL training camp 2022: Why are players wearing Guardian Caps?
Have you seen the strange helmets Cowboys players are wearing in camp? Here's the story
Cowboys, other NFL players wearing padded caps over helmets