Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
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Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
story Archives - Page 6 of 7 - The Atavist Magazine
The story behind those soft-shell puffy Guardian Caps players have been wearing
NFL: Concussions dropped by more than 50% among players who wore Guardian Caps during summer
NFL hopes to reduce head injuries with helmet experiment
NFL hopes to reduce head injuries with helmet experiment
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
Puffy Guardian Caps Could Reduce NFL Player Concussions
Online, 'unalive' means death or suicide. Experts say it might help kids discuss those things
The story behind those soft-shell puffy Guardian Caps players have been wearing
