Could NFL eventually go without helmets?
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NFL expands rule against misuse of helmet; Guardian Caps required in regular season, postseason
Riddell's Axiom could be breakthrough helmet for football
How often do NFL helmets get replaced and repainted? - Quora
Seattle Seahawks Unsigned Riddell FLASH Alternate
Here's What Football Helmets of the Future Must Look Like If the NFL Is Going to Survive
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
Keeping Football Helmets Cool - ASME
Football helmets are creating more problems than they solve
Football helmets don't protect against concussion — and we're not sure what does
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
