Guardian Caps Guardian Sports
NYSportsJournalism.com - NFL Guardian (Caps) Of The Preseason Galaxy - Safety Impact: NFL Expands Presence As Guardian (Caps) Of The Preseason Galaxy
Playing with a pillow on your head': Buffalo Bills embrace new helmet covers
NFL: Concussions dropped more than 50% with Guardian Caps
Guardian Caps Timeline in the NFL - Guardian Sports
Concussions among players who wore Guardian Caps over summer dropped more than 50%, NFL says - ESPN
Guardian Caps: Why some NFL players are wearing them in training camps
NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
NFL hopes to reduce head injuries with helmet experiment
NFL players experimenting with 'Guardian Caps' to prevent head injuries