Composites tackle concussions
Report warned Riddell that no helmet could prevent concussions but
This Flexible Football Helmet Absorbs Hits Like a Car Bumper
Neck-worn bandage sensors could better warn of concussions
This Flexible Football Helmet Absorbs Hits Like a Car Bumper
Innovation produces football's helmet of the future
Football helmet - Wikipedia
First Look: Bontrager's New WaveCel Helmet Technology - Pinkbike
NFL at 100: Helmets go high tech in quest for player safety