Guardian Caps are the latest effort to address CTE, football concussion concerns
What are Guardian Caps? Shadow Hills football using new device to reduce head injuries
NFL hopes to reduce head injuries with helmet experiment
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Football Guardian Cap draws mixed reviews from players, experts for safety effectiveness - The Daily Tar Heel
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Guardian Cap Debuts at Training Camps League-wide
Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries
NFL says positions wearing Guardian Caps saw 52% decrease in concussions - NBC Sports
NFL hopes to reduce head injuries with helmet experiment
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
Ban on helmet covers sparks controversy
The Longevity Project: Traumatic brain injury and concussion protocols in youth sports
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