Guardian Caps: Why some NFL players are wearing them in training camps
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Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Robert Saleh dislikes the new Guardian Caps: And he has a point
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL says Guardian Caps reduced concussions by more than 50%
Guardian Caps debut at NFL training camps around the league
NFL hopes to reduce head injuries with helmet experiment
Steelers debut new, safer helmets for off-season training
NFL Introduces Guardian Caps At First Week Of Training Camp - The Sports Credential
What are NFL players wearing on their helmets at training camp and how do they work? - The Mirror US
