NFL players wear Guardian Caps to reduce head trauma during training camp
What are Guardian Caps? NFL's latest padded helmets for added safety
Anything we can do to protect them: East Clarendon uses Guardian Caps to protect against concussions - The Sumter Item
Anything we can do to protect them: East Clarendon uses Guardian Caps to protect against concussions - The Sumter Item
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
John's Journal: Park Football Team Is All In On Concussion Safety, News
Padded helmet cover shows little protection for football players - Scope
EXPLAINER: NFL using helmet caps for player safety, research
Do Padded Helmet Covers Actually Protect Football Players? - The Good Men Project