NFL hopes to reduce head injuries with helmet experiment - Wilmington News Journal
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
EXPLAINED: US National Football League Using Helmet Caps For Player Safety, Research - News18
Coverage of the NFL in Guardian Caps
What is a Guardian Cap? Meet the NFL's newest safety measure
Florio PFT] The Guardian Cap apparently works. But if a player asks to wear it in a game, the league would say no. : r/nfl
What are those funny-looking soft caps on NFL helmets during camp?, Sports
Why guardian caps are now part of practice helmets for certain Titans
Raiders, other NFL teams wear Guardian Caps for head safety, Raiders News
Guardian Caps are the latest effort to address CTE, football concussion concerns
NFL Guardian Caps: How Do They Work? – NBC 5 Dallas-Fort Worth
New York Jets coach Robert Saleh says he's concerned over use of new protective helmet shells - ESPN
Coverage of the NFL in Guardian Caps
NFL says regular-season concussions increased 18% in 2022 - ESPN