NFL: Concussions dropped by more than 50% among players who wore Guardian Caps during summer
NFL Mandated Guardian Caps: Controversial Change - Sports Illustrated Seattle Seahawks News, Analysis and More
NFL players don Guardian Caps, designed to protect from concussion
NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer
NFL says positions wearing Guardian Caps saw 52% decrease in concussions - NBC Sports
NFL players wear Guardian Caps to reduce head trauma during training camp
Concussions among players who wore Guardian Caps over summer dropped more than 50%, NFL says - ESPN
Ravens Embrace the Funny-Looking Guardian Helmets - Sports Illustrated Baltimore Ravens News, Analysis and More
Packers Coach Matt LaFleur Questions Protective Guardian Cap - Sports Illustrated Green Bay Packers News, Analysis and More
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN