NFL concussion lawsuits explained, NFL
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
Built By Data: NFL Helmet Innovation
Guardian Caps Guardian Sports
The dangers of concussions in high school sports
New Schutt Helmet: Vengeance (Rev.) – The Concussion Blog
NFL players experiment with 'Guardian Caps' to protect heads
Complaints begin regarding Guardian Caps, despite one important hidden benefit - NBC Sports
Helmet Innovation: Continued advancements to keep players safer
This might be a dumb question, but why do they wear these extra pads on their helmets for camp but remove them for games? : r/KansasCityChiefs
Built By Data: NFL Helmet Innovation