NFL executive hints that Guardian Caps could eventually be worn in

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NFL makes Guardian Caps mandatory for many positions through second preseason game - NBC Sports

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Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN

NFL expands rule against misuse of helmet; Guardian Caps required in regular season, postseason

Puffy Guardian Caps Could Reduce NFL Player Concussions

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Guardian Caps: NFL requires use of helmet cover at training camps

NFL considers eliminating hip-drop tackles, will review the 'tush push' again after the season