NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
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EXPLAINER: NFL using helmet caps for player safety, research - The San Diego Union-Tribune
At training camp, extra helmet padding is designed to reduce head trauma for Commanders players
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
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Why are players wearing padded helmets at NFL training camps?
These puffy helmet caps are the next big thing in NFL player safety, National Sports
What's With Those Padded Caps NFL Players Are Wearing In Training Camp?