Youth football team first in NKY to use impact-reduction helmets to help protect athletes
Guardian helmet caps are being used to mitigate concussion issues
Metro Youth Football Association buys guardian caps for helmets to help reduce collision impacts
NFL hopes to reduce head injuries with helmet experiment
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
NFL says positions wearing Guardian Caps saw 52% decrease in concussions - NBC Sports
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
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
Guardian cap' to prevent head injuries mandated for practices, CFL says
Guardian cap makes its debut at Titans training camp
PDF) Guardian Caps: What's the Impact? Seth E Jenny, Wardell Rouse, and Ashlie Seibles
Guardian cap' to prevent head injuries mandated for practices, CFL says
Shadow Hills football implements helmet covers to reduce head injuries
NFL says positions wearing Guardian Caps saw 52% decrease in concussions - NBC Sports