This Flexible Football Helmet Absorbs Hits Like a Car Bumper
Football helmets are creating more problems than they solve
NFL, NFLPA approve first position-specific helmet for linemen
Unpopular guardian caps could provide false sense of security
87 out of 91 Deceased NFL Players Test Positive for Brain Disease - From Frontline : r/nfl
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
Inside Slant: Re-imagining NFL helmets - ESPN - NFL Nation- ESPN
New Helmet Technology Reduces Brain Injuries, Dr. John Lloyd
Forrest Blue - The Hollow Man - Sactown Magazine