This Helmet Will Save Football. Actually, Probably Not. - The New York Times
NFL, NFLPA Release 2021 Helmet Laboratory Testing Performance Results
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
Substance Better Protection for Football Players - Substance
How New Helmet Technology Will Make the NFL and NHL Safer, News, Scores, Highlights, Stats, and Rumors
Everything you need to know about the NFL's helmet guidelines and restrictions - Canal Street Chronicles
Evaluation of the Effectiveness of Newer Helmet Designs with Emergent Shell and Padding Technologies Versus Older Helmet Models for Preserving White Matter Following a Season of High School Football
Design and Virtual Testing of American Football Helmets–A Review
Chargers News: NFL, NFLPA approves first-ever position-specific helmets - Bolts From The Blue
NFL helmet safety testing results: Vicis ranks first again for its high-tech head protector – GeekWire
Design and Virtual Testing of American Football Helmets–A Review
Helmet Innovation: More and Better Choices, Fewer Concussions