The N.F.L.'s Favorite Helmet Maker Is in Financial Trouble - The New York Times
Say Goodbye to the Construction Hard Hat
Helmet safety: Inside the complicated equipment industry - Sports Illustrated
NFL's Safest Helmets Absorb Impact With 3D Printing Instead Of Foam
How Additive Manufacturing Is Making A Difference In Sports – Sports Technology Blog
Can a Better Football Helmet Save Your Kid's Brain? - Washingtonian
CrossHelmet - the smart motorcycle helmet by Borderless — Kickstarter
Are lighter football helmets safer? Carlsbad company banking on it - The San Diego Union-Tribune
Review Addendum: Bluegrass Legit Carbon Helmet - I Tested It More by Crashing - Pinkbike
Innovative Liquid Cushioning Technology Promises Revolution in Safety Gear
The best cycling helmets - safe and stylish helmets tested and reviewe – Rouleur
Bike Helmet Rotational Force Protection, Explained