NFL players sporting Oakley visors - All About Vision
Why the Ticats are wearing those giant helmets at practice
Xenith Named a Finalist in the 2021 NFL Helmet Challenge, Granted $496,500 | Xenith Football Helmets, Shoulder Pads & Facemasks
3 Ingenious innovations from the NFL's Helmet Challenge | Digital Trends
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NFL Helmet Challenge Raises the Bar for Helmet Technology and Performance, Awards $1.55 Million in Grant Funding to Help New Models Get on Field Faster
Guardian Caps, a soft-shell helmet cover, among CFL's new player-safety initiatives | CBC Sports
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NFL safety: How VICIS' position-specific helmets have become all the rage - The Athletic