Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
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What are Guardian Caps? NFL's latest padded helmets for added safety
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
[Smith] NFL says positions wearing Guardian Caps saw 52% decrease in concussions : r/nfl
September 2013 – The Concussion Blog
NFL hopes to reduce head injuries with helmet experiment
Damar Hamlin and Sam Peltzman: Where Football Meets Economics - Econlib
Players, coaches react to mandatory use of Guardian Caps
Shell game: Player safety looming concern as new season approaches, Local Sports
Guardian Caps Guardian Sports
NFL: Concussions dropped by more than 50% among players who wore Guardian Caps during summer
What are Guardian Caps? NFL's latest padded helmets for added safety
Football helmet - Wikipedia
NFL Guardian Caps: How Do They Work? – NBC 5 Dallas-Fort Worth
Bolingbrook Park District 2014 Summer Guide by Bolingbrook Park District - Issuu
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
