High schools try to cap concussions
Guardian Caps Exceed NFL's Expectations - Guardian Sports
NFL: Concussions dropped by more than 50% among players who wore Guardian Caps during summer
Packers share thoughts on wearing Guardian Caps at camp
Ravens Embrace the Funny-Looking Guardian Helmets - Sports Illustrated Baltimore Ravens News, Analysis and More
Xaverian High in Mass. introduces Guardian Caps for football players
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Robert Saleh dislikes the new Guardian Caps: And he has a point
Guardian Cap used by football teams to protect against head injury – The Denver Post