Guardian Caps: Why some NFL players are wearing them in training camps
Robert Saleh dislikes the new Guardian Caps: And he has a point
Quotebook Notebook: Jason Kelce remains hungry in Year 12
NFL expands rule against misuse of helmet; Guardian Caps required in regular season, postseason
Guardian Caps debut at training camps throughout NFL
NFL Mandated Guardian Caps: Controversial Change - Sports Illustrated Seattle Seahawks News, Analysis and More
Guardian Caps Exceed NFL's Expectations - Guardian Sports
Guardian cap' to prevent head injuries mandated for practices, CFL says
Football Guardian Caps XT (Current Model) – Guardian Sports
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Frequently Asked Questions
Colleges add Guardian football protective helmet cap - Sports Illustrated
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
What is a Guardian Cap? Meet the NFL's newest safety measure