NFL and players union announce new quarterback-specific helmet to combat concussions
NFL Changes Rule Penalizing Lowering Of The Helmet Ahead Of 2022 Season - Steelers Depot
Football helmet with liquid padding may prevent concussions
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
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First quarterback helmet designed to help reduce concussions is approved., RR NEWS USA
Can helmet design reduce the risk of concussion in football? in: Journal of Neurosurgery Volume 120 Issue 4 (2014) Journals
New NFL Helmet Cuts Quarterback Concussion Risk—But Only 7% Better Than Older Models
NFL: Concussions dropped by more than 50% among players who wore Guardian Caps during summer
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