Puffy, spongy Guardian Caps could help curb NFL head injuries

NFL: Concussions dropped by more than 50% among players who wore Guardian Caps during summer

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NFL had seven-year low in training-camp concussions, thanks to Guardian caps - NBC Sports

NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer

The Football Player's Brain That Sparked the NFL's Concussion Crisis - The Atlantic

What's with padded helmet caps teams are wearing

NFL Makes Ruling On Players Wearing Guardian Cap During Game - The Spun: What's Trending In The Sports World Today

Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN

NFL hopes to reduce head injuries with helmet experiment

NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer

Puffy Guardian Caps Could Reduce NFL Player Concussions

Guardian Caps: NFL's hotly debated new safety measure here to stay?

NFL Releases Concussion Data After Use of 'Guardian Caps' During Offseason - Sports Illustrated