Guardian cap' to prevent head injuries mandated for practices, CFL says
Florio PFT] The Guardian Cap apparently works. But if a player asks to wear it in a game, the league would say no. : r/nfl
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
Asked and Answered: Aug. 8
Asked and Answered: June 14
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Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries