Park High School football blazes safety trail with Guardian Caps
NFL Expands Use Of Guardian Caps In 2023 - Steelers Depot
EXPLAINER: NFL using helmet caps for player safety, research
If a player wanted to wear a Guardian Cap during a game, the league would prohibit it
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Could Guardian Caps be used in games? : r/nfl
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Can new technology help cut down on concussions? (video)
What are Guardian Caps? NFL hopes to reduce head injuries with helmet experiment
LA Rams to deploy Guardian Cap safety helmets for training camp