Guardian Caps debut at training camps throughout NFL
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NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
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NFL exec suggests Guardian Caps worn to protect players during practices could one day debut in games
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Guardian Protective Helmet Cover - XT Model
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NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL players beginning to adopt protective Guardian Caps over helmets at practice - NBC Sports