NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer
More padding the issue of concussions and better helmets
NFL players experiment with 'Guardian Caps' to protect heads - The San Diego Union-Tribune
John's Journal: Park Football Team Is All In On Concussion Safety, News
Why are some Titans players wearing Guardian Caps during training camp?, Titans
The epidemic of concussions in the NFL - The Paisano