More padding the issue of concussions and better helmets
Football helmets are creating more problems than they solve
NFL Helmet Challenge: Increasing player safety, nTop
Clemson researchers use linear impact testing machine to help determine future of football helmet facemasks
Virginia Tech research provides much-needed data, system for rating sports equipment - ESPN
Football Helmets for 2017 - Riddell and Schutt Helmet Technology
NFL's new quarterback specific helmet design – United Brain Association
The Zero1 Flexible Football Helmet May Save Players' Brains
In Race to Develop Safer Football Helmets, Many Questions Remain - The New York Times