NFL players experiment with 'Guardian Caps' to protect heads
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What is the NFL Guardian Cap? Will it do anything to reduce concussion? — Dr. Mark Heisig
Guardian Caps: Why some NFL players are wearing them in training camps
Football Helmet Shell Add-On Testing
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
EXPLAINER: NFL using helmet caps for player safety, research
NFL players experimenting with 'Guardian Caps' to prevent head injuries
NFL training camps: Guardian Cap players are wearing over helmets, why
NFL players experiment with Guardian Caps // Guardian Sports
More padding the issue of concussions and better helmets
NFL hopes to reduce head injuries with helmet experiment
NFL hopes to reduce head injuries with helmet experiment
NFL hopes to reduce head injuries with helmet experiment
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