Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
More Guardian Caps, And '0' On The Field
NFL hopes to reduce head injuries with helmet experiment
Ohio State Players Aim To Reduce Head Injuries With Guardian Caps
NFL Training Camp: 12 photos of players wearing the new Guardian Caps
Guardian cap' to prevent head injuries mandated for practices, CFL says
NFL hopes to reduce head injuries with helmet experiment - Seattle Sports
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
NFL hopes to reduce head injuries with helmet experiment
Raiders, other NFL teams wear Guardian Caps for head safety, Raiders News
EXPLAINER: NFL using helmet caps for player safety, research
Packers Share Thoughts on Wearing Guardian Caps at Camp, WTAQ News Talk, 97.5 FM · 1360 AM
EXPLAINED: US National Football League Using Helmet Caps For Player Safety, Research - News18
Packers LB De'Vondre Campbell on wearing Guardian Caps: 'I just think it's stupid'