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NFL Presents: League-wide Guardian Cap Use to Reduce Head Impacts
CFL introduces mandatory extra helmet protection for multiple positions. As well as other new health & safety measures. : r/sports
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What are Guardian Caps? NFL's latest padded helmets for added safety
NFL hopes to reduce head injuries with helmet experiment
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
Guardian Caps Guardian Sports
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
Why are NFL players wearing padding on helmets at training camp?
EXPLAINER: NFL using helmet caps for player safety, research
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN