Anything we can do to protect them: East Clarendon uses Guardian Caps to protect against concussions - The Sumter Item
NFL players experimenting with 'Guardian Caps' to prevent head injuries
Guardian Caps Debut During NFL Minicamps
If a player wanted to wear a Guardian Cap during a game, the league would prohibit it - NBC Sports
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
EXPLAINER: NFL using helmet caps for player safety, research
The Coat of Arms Added Protection or False Security: Football Tests New Guardian Caps to Prevent Concussions
Chicago Bears: Why players are wearing padded helmets
Staples football pioneers use of 'Guardian Caps'
Quarterback-specific helmet to be available during 2023 NFL season
More teams practicing with Guardian Caps, Sports
Utah Utes football adds new concussion-reducing helmets for fall camp
The Coat of Arms Added Protection or False Security: Football Tests New Guardian Caps to Prevent Concussions