What are Guardian Caps? NFL's latest padded helmets for added safety
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NFL players wear Guardian Caps to reduce head trauma during training camp
Ravens Embrace the Funny-Looking Guardian Helmets - Sports Illustrated Baltimore Ravens News, Analysis and More
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NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Packers share thoughts on wearing Guardian Caps at camp
Essexville Garber commits to playing home football games on home soil
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear