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Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
1970 Len Dawson Kansas City Chiefs Super Bowl IV Game-Used & Autographed Helmet
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The Daily Helmet: Size Matters: Mini Pocket Or Mini Mini or Gumball
Game Used NFL Memorabilia for sale
Padded helmet cover shows little protection for football players - Scope
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What are Guardian caps? See the NFL's latest head protection device - Deseret News
Jason Ferguson Game-Used Cowboys Throwback Helmet (w/Team Letter) - Memorabilia Expert