The Football Player's Brain That Sparked the NFL's Concussion
Guardian Caps: NFL requires use of helmet cover at training camps
FOOTBALL: NFL following Sequim's lead with protective caps
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NFL hopes to reduce head injuries with helmet experiment - Seattle
NFL players experimenting with 'Guardian Caps' to prevent head
Padded helmet cover shows little protection for football players
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
NFL report: concussions dropped 50 PERCENT when players wore new
New Football Helmet Could Save the Sport
Guardian Caps Guardian Sports
Safety first: Lopers to wear padded caps in practice to prevent
NFL players don Guardian Caps, designed to protect from concussion
Staples football pioneers use of 'Guardian Caps'