Complaints begin regarding Guardian Caps, despite one important hidden benefit - NBC Sports
EXPLAINER: NFL using helmet caps for player safety, research
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NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
NFL training camps: Guardian Cap players are wearing over helmets, why
Truth About Guardian Caps
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
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NFL Mandates Guardian Caps >> Guardian Sports