NFL Players Experiment With 'Guardian Caps' to Protect Heads – NBC Connecticut
NFL, NFLPA release results of annual helmet testing: Three previously approved models now prohibited
First QB helmet designed to help reduce concussions approved - Newsday
Jets' Aaron Rodgers says he 'will rise yet again' in first comments since season-ending injury – NewsNation
NFL, NFLPA approve first position-specific helmet for linemen
First QB helmet designed to help reduce concussions approved - Newsday
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
NFL, NFLPA approve first position-specific helmet for linemen
NFL, NFLPA Approve Position-Specific Helmets for OL, DL; Features Safety Bumpers, News, Scores, Highlights, Stats, and Rumors
NYSportsJournalism.com - NFL Testing Approves First QB-Specific Helmet - Concussion Discussion: NFL-NFLPA Tests Approve First QB-Specific Helmet
New NFL QB Helmet: How much do these new helmets reduce concussions?
NFL updates approved helmet list and rankings for players to choose