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What Pros Wear: Top 5 Helmets Rated by the NFL & NFLPA - What Pros Wear
Football helmets at Philadelphia-area high schools shed light on growing concussion concerns
The History of Football Helmets, Xenith
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Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Patriots Mailbag: Training Camp Studs, O-Line Concerns as Preseason Arrives
NFL Reveals New Quarterback-Specific Helmet To Help Combat Head Injury - The Sports Credential
What Pros Wear: What Do NFL Offensive Lineman Wear? Here's the Helmets, Cleats and Gloves Worn by NFL Starting OL in 2021 - What Pros Wear
Are NFL Football Hits Getting Harder And More Dangerous? : Shots - Health News : NPR
Guardian Caps Guardian Sports
Riddell's Axiom could be breakthrough helmet for football