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What are Guardian Caps and how are they helping football teams?
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Guardian Caps debut at training camps throughout NFL
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Guardian Caps: What are they and why are NFL players wearing them? - Sactown Sports
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
Guardian cap' to prevent head injuries mandated for practices, CFL says
NFL CMO Dr. Sills on Guardian Caps Mandate >> Guardian Sports