NFL introduces Guardian Caps across league to limit number of brain injuries in preseason
NFL exec suggests Guardian Caps worn to protect players during practices could one day debut in games
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
The Coat of Arms Added Protection or False Security: Football Tests New Guardian Caps to Prevent Concussions
What are Guardian Caps? Shadow Hills football using new device to reduce head injuries
NFL rejects polyurethane safety caps for football helmets
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
NFL 2023 Season Guardian Caps Mandate Supported By 52% Concussion Drop – Sports Techie
Guardian' helmet caps help protect Herd linemen, Marshall Sports
The impact of 'Guardian Caps' on player safety
What are Guardian Caps and how are they helping football teams?
Concussions among players who wore Guardian Caps over summer dropped more than 50%, NFL says - ESPN
NFL mandates use of Guardian Caps for training camp in 2022 - Cincy Jungle