Protective helmets make sports safer
NFL Helmet Challenge: Increasing player safety, nTop
NFL's Safest Helmets Absorb Impact With 3D Printing Instead Of Foam
Material for safer football helmets may reduce head injuries
NFL Helmet Challenge: Increasing player safety, nTop
Applied Sciences, Free Full-Text
How Engineers Are Making Football Helmets Safer
This Football Helmet Crumples—and That's Good
Detroit business Xenith wins $496,500 to help improve NFL helmet safety