NFL at 100: Helmets go high tech in quest for player safety
NFL to prohibit use of certain helmets for 1st time
Football helmet with liquid padding may prevent concussions
Kentucky high school football team wearing Vicis Zero1 helmet, the safest according to the NFL.
Design and Virtual Testing of American Football Helmets–A Review
How New Helmet Technology Will Make the NFL and NHL Safer, News, Scores, Highlights, Stats, and Rumors
This Flexible Football Helmet Absorbs Hits Like a Car Bumper
New Football Helmet May Reduce Concussions
A High-Tech Helmet Protects Football Players from Concussions - Seattle magazine
$1.37 Million Awarded in HeadHealthTECH Grant Funding to NFL Helmet Challenge Applicants
Football helmets don't provide much protection from concussions, study suggests - CBS News
Helmet market, with deep Detroit ties, in arms race
Packers are using high-tech helmets in hopes of lowering concussions - The Athletic