What are those funny-looking soft caps on NFL helmets during camp?, Sports
NFL Presents: League-wide Guardian Cap Use to Reduce Head Impacts
EXPLAINER: NFL using helmet caps for player safety, research
Guardian Caps are the latest effort to address CTE, football concussion concerns
What is a Guardian Cap? Meet the NFL's newest safety measure
Head case: Batting helmet's development began in Pittsburgh
Jets' Robert Saleh is concerned about impact of Guardian Caps on player safety
NFL CMO Dr. Allen Sills calls kickoff rule 'stopgap' measure, talks future of playing surfaces, Guardian Caps
NFL Guardian Caps: How Do They Work? – NBC 6 South Florida
NFL drafts 3 Mississippi docs for medical team
Guardian Caps Guardian Sports
Guardian Cap: What are and why the NFL asks this safety measure in helmets
NFL chief medical officer: Asymptomatic people are not spreading COVID-19 - The Boston Globe