NFL helmet safety testing results: Vicis ranks first again for its high-tech head protector – GeekWire
NFL to prohibit use of certain helmets for first time
NFL & NFLPA approve first position-specific helmet for linemen – New York Daily News
Vicis ranks first in 'extensive' NFL helmet test that assesses head impact severity – GeekWire
Vicis ranks first in 'extensive' NFL helmet test that assesses head impact severity – GeekWire
The 2018 Vicis Zero1 Wins Top Honors in NFL and NFLPA Testing
Evolution of the football helmet, including those emblems we're so used to seeing – Orange County Register
NFL helmet maker helping curb soldiers' head injuries, Sports
The AFL is mandating helmet sensors. How long before the NFL and NCAA follow suit? - Footballscoop
Future of football safety could come down to research at Riddell
The NFL calls Vicis Zero1 helmets the safest yet