Guardian helmet caps are being used to mitigate concussion issues
NFL hopes to reduce head injuries with helmet experiment
Guardian Caps Making Impacts on All Levels of Football
NFL hopes to reduce head injuries with helmet experiment
NFL: Concussions dropped by more than 50% among players who wore Guardian Caps during summer
2015 Football Media Guide by Army West Point Athletics - Issuu
Youth football team first in NKY to use impact-reduction helmets to help protect athletes
A Helmet Shortage Is Hitting High School Football Across the Country - The New York Times
Ohio State Aiming To Reduce Head Injuries With Guardian Caps - Sports Illustrated Ohio State Buckeyes News, Analysis and More
NFL players wear Guardian Caps to reduce head trauma during training camp
NFL hopes to reduce head injuries with helmet experiment
Hallelujah! 12-Team College Football Playoff Approved – FRANK THE TANK'S SLANT
What are Guardian Caps? Shadow Hills football using new device to reduce head injuries