VICIS, which makes 'safest' helmet used by NFL players, is almost out of money
Youth Football Helmet Ratings
The Zero1 Flexible Football Helmet May Save Players' Brains
This Startup's 2 Helmets Are Officially the Safest in Football, According to the NFL
NFL helmet maker helping curb soldiers' head injuries – The Denver Post
The 2018 Vicis Zero1 Wins Top Honors in NFL and NFLPA Testing
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NFL, NFLPA ban 10 helmet models
The Football Helmet Just Got the Biggest Redesign Since the 1960s--and It's Coming to the NFL Next Season
Vicis pulls concussion-resistant helmets from UW camp - Sports Illustrated