NFL Releases Concussion Data After Use of 'Guardian Caps' During Offseason - Sports Illustrated
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Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
NFL hopes to reduce head injuries with helmet experiment
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
Coverage of the NFL in Guardian Caps
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As NFL mandates Guardian caps in practice, area high school football teams have been using them for years, Sports
The story behind those soft-shell puffy Guardian Caps players have been wearing