Guardian Cap: What are and why the NFL asks this safety measure in helmets
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Football Guardian Cap draws mixed reviews from players, experts for safety effectiveness - The Daily Tar Heel
So what exactly is that black padding on the Syracuse football helmets seen during practice?
More padding the issue of concussions and better helmets
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
Rifle football using new Guardian Caps
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NFL players don Guardian Caps, designed to protect from concussion
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As NFL mandates Guardian caps in practice, area high school football teams have been using them for years, Sports
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries