NFL hopes to reduce head injuries with helmet experiment
NFL players wear Guardian Caps to reduce head trauma during
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Guardian Cap Use a Concern for Watt, Saleh Early in Training Camp
Guardian Cap debuts during minicamps in effort to reduce avoidable
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Could Guardian Caps be used in games? - NBC Sports
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LA Rams to deploy Guardian Cap safety helmets for training camp
Coverage of the NFL in Guardian Caps
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Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries