NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
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Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Arizona Wildcats football training camp report: Day 3 - Arizona Desert Swarm
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Coverage of the NFL in Guardian Caps
Steelers' Kenny Pickett concussion update
Guardian Caps: NFL's hotly debated new safety measure here to stay?
The story behind those soft-shell puffy Guardian Caps players have been wearing
Puffy Guardian Caps Could Reduce NFL Player Concussions HowStuffWorks
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Guardian Caps Guardian Sports
NFL says Guardian Caps reduced concussions by over 50%
Why Alabama football players are wearing padded helmets in practice