Football helmet - Wikipedia
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
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What are Guardian Caps? NFL's latest padded helmets for added safety
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Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
What are Guardian Caps? NFL's latest padded helmets for added safety
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Football helmet - Wikipedia
Guardian Caps leave some NFL players and coaches with concerns: 'You feel like a bobblehead'