Guardian Caps: What Are They & How Do They Work?
Park High School football blazes safety trail with Guardian Caps
NFL hopes to reduce head injuries with helmet experiment
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
Guardian Sports - Guardian Caps Testimonials
Why Alabama football players are wearing padded helmets in practice
As NFL mandates Guardian caps in practice, area high school football teams have been using them for years, Sports
Finite Element Models: New Tools for Innovation in Football Helmet Design
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
So what exactly is that black padding on the Syracuse football helmets seen during practice?