Watch NBC Nightly News With Lester Holt Excerpt: NFL
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
NFL helmet safety testing results: Vicis ranks first again for its high-tech head protector – GeekWire
Riddell's Axiom could be breakthrough helmet for football
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
VICIS, which makes 'safest' helmet used by NFL players, is almost out of money
What Pros Wear: Top 5 Helmets Rated by the NFL & NFLPA - What Pros Wear
Helmet Innovation: More and Better Choices, Fewer Concussions
N.F.L.'s Release of Data on Helmet Tests Raises Concerns - The New York Times
New Helmet Technology Aimed to Make Football and Other Sports Safer
Football Helmet Testing, Technology and Safety Research