FOOTBALL: Guardian Caps gaining ground as concussion-prevention aid
Padded helmet cover shows little protection for football players - Scope
As NFL mandates Guardian caps in practice, area high school football teams have been using them for years, Sports
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Helmets don't eliminate concussions. It's time for the NFL to ditch them, NFL
Anything we can do to protect them: East Clarendon uses Guardian Caps to protect against concussions - The Sumter Item
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
NFL hopes to reduce head injuries with helmet experiment, Sports
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Bombers set to don Guardian Caps” on helmets at training camp
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
NFL stars could wear motorcycle-style helmets as the sport searches for new ways to protect players from head injury and concussion: 'There are big strides we can still take'
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
NFL players experimenting with 'Guardian Caps' to prevent head injuries