NFL exec suggests Guardian Caps worn to protect players during practices could one day debut in games
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Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Steelers Debut New Guardian Caps For Practice As Part Of New NFL Mandate - Steelers Depot
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NFL players wear Guardian Caps to reduce head trauma during training camp
The NFL Has Introduced 'Guardian Caps' to Reduce Concussions, and Made Them Mandatory. But Only for Some Positions. And Only Through the 2nd Preseason Game.
Despite Risks, N.F.L. Leaves Helmet Choices in Players' Hands - The New York Times
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What are Guardian Caps? NFL players sport specialty helmets for 2022 minicamp
Why don't rugby players wear helmets like NFL players? - Quora
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77