What is the NFL guardian cap and how does it work? – NBC Sports Bay Area & California
NFL training camps: Guardian Cap players are wearing over helmets, why
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Guardian Cap Debuts at NFL Training Camps League-wide
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Packers Practice Roundup - August 17, 2023 (2nd Patriots Joint Practice)
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
Steelers HC Mike Tomlin on what players think of Guardian Caps
Packers LB De'Vondre Campbell on wearing Guardian Caps: 'I just think it's stupid'
NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer
Packers News, 8/2: Defense makes its first big statement in first day of padded practice - Acme Packing Company