NFL, players' union approve QB-specific helmet designed to reduce
NFL to test new position-specific helmet designed for linemen - ESPN
NFL downgrades safety of 9 helmet models used by 18 percent of
Built By Data: NFL Helmet Innovation
VICIS has top 3 helmets in survey including lineman model
NFL safety: How VICIS' position-specific helmets have become all
VICIS on LinkedIn: Prepping for his 7th NFL season, Russell Wilson
Digital design, QB investments could aid football helmet safety - ESPN
The NFL calls Vicis Zero1 helmets the safest yet