Guardian Caps debut at training camps throughout NFL
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EXPLAINER: NFL using helmet caps for player safety, research
NFL training camp 2022: Why are players wearing Guardian Caps?
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Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries : r/nfl
NFL players experiment with 'Guardian Caps' to protect heads
NFL mandates extra head protection for training camp
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
Guardian Caps Guardian Sports
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
EXPLAINER: NFL using helmet caps for player safety, research
Carolina Panthers NFL helmets training camp
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
NFL hopes to reduce head injuries with helmet experiment