NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
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Football Helmet Sweat Liners – NoSweat
Guardian Caps, a soft-shell helmet cover, among CFL's new player-safety initiatives | CBC Sports
Riddell Speedflex Varsity Football Helmet
Helmet Co. Thinking Ahead – LIGHT Helmets
NFL & NFLPA approve first position-specific helmet for linemen – New York Daily News
Football Helmet Sweat Liners – NoSweat
Touch Football, Sold as Safer, Now Requires a Helmet - The New York Times
Guardian cap' to prevent head injuries mandated for practices, CFL says | Globalnews.ca
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More padding the issue of concussions and better helmets
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3 Ingenious innovations from the NFL's Helmet Challenge | Digital Trends
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Xenith Named a Finalist in the 2021 NFL Helmet Challenge, Granted $496,500 | Xenith Football Helmets, Shoulder Pads & Facemasks
Football Concussions: Prevention, Diagnosis & Recovery | Cognitive FX
NFL safety: How VICIS' position-specific helmets have become all the rage - The Athletic
Leatherhead to Radio-Head: The Evolution of the Football Helmet | Arts & Culture| Smithsonian Magazine
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL players sporting Oakley visors - All About Vision
NFL Players Experiment With 'Guardian Caps' to Protect Heads – NBC Connecticut
