Football helmets have improved but are far from 'concussion proof' – Orange County Register
NFL Enters Next Era of Helmet Safety with Quarterback-Specific Helmet
NFL, NFLPA approve first position-specific helmet for linemen
NFL's Safest Helmets Absorb Impact With 3D Printing Instead Of Foam
The NFL calls Vicis Zero1 helmets the safest yet
NFL Releases List of Top Safety Helmets - Team Insight
First position-specific helmet ranks No. 2 in NFL lab testing - NBC Sports
NFL rates first ever position-specific helmet No. 2 in lab testing
VICIS ZERO1 Football Helmet Ranks First for Third Consecutive Year in NFL/NFLPA Helmet Performance Testing
Baylor Football to Wear VICIS ZERO1 Helmet for 2018 Season
NFL, union encouraged by helmet safety improvements – Daily Freeman
The Safest Football Helmet Is Not Yet A Hit In The NFL WSJ