NFL, NFLPA Release 2021 Helmet Laboratory Testing Performance Results
Detroit's Xenith among four awardees for NFL's helmet safety development program
NFL helmet safety rankings: Seattle startup Vicis tops list again with high-tech head protector – GeekWire
New NFL Helmets - NFL Testing Validates Benefit of Guardian Caps
2019 Helmet Laboratory Testing Performance Results
VICIS Zero1 tops list in NFL helmet performance testing
Vicis Helmets Claim Top Three Spots in NFL/NFLPA Helmet Laboratory Performance Testing
2018 NFL/NFPA Helmet Laboratory Testing Performance Results Released
What Pros Wear: Top 5 Helmets Rated by the NFL & NFLPA - What Pros Wear
NFL safety: How VICIS' position-specific helmets have become all the rage - The Athletic
Development and Evaluation of a Test Method for Assessing the Performance of American Football Helmets
NFL at 100: Helmets go high tech in quest for player safety