NFL players experiment with 'Guardian Caps' to protect heads
As NFL mandates Guardian caps in practice, area high school
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The Longevity Project: Traumatic brain injury and concussion
Guardian Caps Guardian Sports
What are Guardian Caps? NFL's latest padded helmets for added safety
J.J. Watt not a fan of newly mandated Guardian Caps
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NFL players don Guardian Caps, designed to protect from concussion
Guardian cap' to prevent head injuries mandated for practices, CFL
NFL players experiment with 'Guardian Caps' to protect heads
NFL: Concussions dropped by more than 50% among players who wore
EXPLAINER: NFL using helmet caps for player safety, research