Guardian Caps: NFL requires use of helmet cover at training camps
EXPLAINER: NFL using helmet caps for player safety, research
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NFL executive hints that Guardian Caps could eventually be worn in
[Smith] NFL says positions wearing Guardian Caps saw 52
NFL hopes to reduce head injuries with helmet experiment
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NFL hopes to reduce head injuries with helmet experiment
NFL hopes to reduce head injuries with helmet experiment
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NFL hopes to reduce head injuries with helmet experiment – The