Guardian Cap Use a Concern for Watt, Saleh Early in Training Camp - Sports Illustrated
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Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Ravens Embrace the Funny-Looking Guardian Helmets - Sports Illustrated Baltimore Ravens News, Analysis and More
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NFL hopes to reduce head injuries with helmet experiment
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What are Guardian Caps and how are they helping football teams?
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
5 helmet products and the claims they make
Guardian helmet caps are being used to mitigate concussion issues
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Football Guardian Caps (Current Model) – Guardian Sports
Guardian Caps: Why some NFL players are wearing them in training camps
NFL Guardian Caps: How Do They Work? – NBC Bay Area
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What Pros Wear: Guardian Caps | What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
Vicis expands helmet line with new soft 'cap' for practices, 7-on-7 and flag football – GeekWire
Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries
High school football looks to Guardian Cap for head safety – The Denver Post
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets - CBSSports.com
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Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
