Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries : r/nfl
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Complaints begin regarding Guardian Caps, despite one important hidden benefit - NBC Sports
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As NFL mandates Guardian caps in practice, area high school football teams have been using them for years, Sports
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NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL hopes to reduce head injuries with helmet experiment
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
NFL training camps: Guardian Cap players are wearing over helmets, why
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