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Touch Football, Sold as Safer, Now Requires a Helmet - The New York Times
Leatherhead to Radio-Head: The Evolution of the Football Helmet | Arts & Culture| Smithsonian Magazine
NFL safety: How VICIS' position-specific helmets have become all the rage - The Athletic
Guardian cap' to prevent head injuries mandated for practices, CFL says | Globalnews.ca
3 Ingenious innovations from the NFL's Helmet Challenge | Digital Trends
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Soft Protective Headgear | Buy Soft Shell Helmets & Protective Padded Equipment Online - GameBreaker
Guardian Caps, a soft-shell helmet cover, among CFL's new player-safety initiatives | CBC Sports
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Guardian Caps added to help reduce football concussions - The Witmarsum
1915-1924 Dog Ear Leather Football Helmet Early Soft Leather - Etsy Israel
Football Helmet Sweat Liners – NoSweat
New Invention….V2 – The Concussion Blog
Guardian Caps | Guardian Sports
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NFL players sporting Oakley visors - All About Vision
