NFL hopes to reduce head injuries with helmet experiment
Why are NFL players wearing padding on helmets at training camp?
NFL says positions wearing Guardian Caps saw 52% decrease in concussions - NBC Sports
Raiders, other NFL teams wear Guardian Caps for head safety, Raiders News
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
NFL Mandates Guardian Caps During Training Camp - Team Insight
Guardian Caps, a soft-shell helmet cover, among CFL's new player-safety initiatives
Playing with a pillow on your head': Buffalo Bills embrace new helmet covers
NFL Mandated Guardian Caps: Controversial Change - Sports Illustrated Seattle Seahawks News, Analysis and More
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
Guardian Caps: Why some NFL players are wearing them in training camps
Arizona Cardinals defensive end J.J. Watt not fan of the new league-mandated Guardian Caps on helmets