EXPLAINER: NFL using helmet caps for player safety, research
Guardian Cap: What are and why the NFL asks this safety measure in helmets
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
NFL Presents: League-wide Guardian Cap Use to Reduce Head Impacts
Coverage of the NFL in Guardian Caps
FMIA: Steelers Coach Mike Tomlin Welcomes Training Camp Tour To Latrobe With 3 Words—Bring It On - NBC Sports
Transcript: Fall League Meeting Health and Safety Media Briefing, October 18, 2022
Guardian Cap Use a Concern for Watt, Saleh Early in Training Camp - Sports Illustrated
NFL Presents: League-wide Guardian Cap Use to Reduce Head Impacts