Jason Kelce puts bubblewrap on his helmet, mocking the NFL's dumb new Guardian Cap rules in training camp
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
NFL Guardian Caps: How Do They Work? – NBC 5 Dallas-Fort Worth
Guardian Caps Guardian Sports
CFL introduces mandatory extra helmet protection for multiple positions. As well as other new health & safety measures. : r/sports
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
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Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Guardian Caps', NFL's Most Recent Attempt At Preventing, 53% OFF
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
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NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets