NFL hopes to reduce head injuries with helmet experiment
First QB helmet designed to help reduce concussions approved by NFL, NFLPA
What is the NFL guardian cap and how does it work? – NBC Sports Bay Area & California
As NFL mandates Guardian caps in practice, area high school football teams have been using them for years, Sports
NFL hopes to reduce head injuries with helmet experiment
NFL says Guardian Caps reduced concussions by over 50%
'I think it'll just become the norm': Browns wearing Guardian Caps to prevent head injury during training camp
NFL players wear Guardian Caps to reduce head trauma during training camp
Could Guardian Caps be used during NFL games for player safety?, Pro Football Talk
Why are NFL players wearing padding on helmets at training camp?
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
NFL says positions wearing Guardian Caps saw 52% decrease in concussions - NBC Sports
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
NFL reports reduction in concussions among players who wore Guardian Caps in preseason - The Athletic