Revolutionary new ZERO1 football helmet already in play, said to help dramatically reduce concussions
Sources -- AB says no football without old helmet - ESPN
NFL, NFLPA Release 2020 Helmet Laboratory Testing Performance Results
Detroit's Xenith among four awardees for NFL's helmet safety development program
NFL Testing Validates Benefit Of Guardian Caps - Sports Biometrics Conference
Comparison of Laboratory and On-Field Performance of American Football Helmets
Development and Evaluation of a Test Method for Assessing the Performance of American Football Helmets
Comparison of Laboratory and On-Field Performance of American Football Helmets
Vicis Zero1 Football Helmet Again Ranks No. 1 In NFL/NFLPA Helmet Performance Testing
Helmet Laboratory Testing Performance Results