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Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
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Guardian Cap Debuts at Training Camps League-wide
Park High School football blazes safety trail with Guardian Caps
Florio PFT] The Guardian Cap apparently works. But if a player asks to wear it in a game, the league would say no. : r/nfl
NFL hopes to reduce head injuries with helmet experiment
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Guardian cap' to prevent head injuries mandated for practices, CFL says
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Guardian Caps debut at training camps throughout NFL