Certain NFL players must wear Guardian Caps through second preseason game
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What is the NFL Guardian Cap? Will it do anything to reduce concussion? — Dr. Mark Heisig
NFL Guardian Caps: How Do They Work? – NBC 5 Dallas-Fort Worth
NFL hopes to reduce head injuries with helmet experiment – The Morning Call
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
Guardian Caps debut at NFL training camps around the league
NFL introduces Guardian Caps across league to limit number of brain injuries in preseason
Guardian Caps: Why some NFL players are wearing them in training camps
NFL concussions Guardian Cap - TSN.ca
Notebook Jets HC Robert Saleh Assesses the Guardian Helmet
Why are NFL players wearing padding on helmets at training camp?
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
Steelers players wearing caps at training camp
Cowboys seen wearing protective, NFL mandated Guardian Caps at OTAs
