Guardian Caps: Why some NFL players are wearing them in training
EXPLAINER: NFL using helmet caps for player safety, research
NFL players experimenting with 'Guardian Caps' to prevent head
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NFL Expands Use Of Guardian Caps In 2023 - Steelers Depot
What is a Guardian Cap? Meet the NFL's newest safety measure
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NFL hopes to reduce head injuries with helmet experiment
NFL to expand use of Guardian Caps in preseason, regular season
What Pros Wear: Guardian Caps What are Those Helmet Covers Being
Certain NFL players must wear Guardian Caps through second