What are Guardian Caps and how are they helping football teams?
NFL hopes to reduce head injuries with helmet experiment - The San Diego Union-Tribune
NFL players don Guardian Caps, designed to protect from concussion
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL reports reduction in concussions among players who wore Guardian Caps in preseason - The Athletic
Concussions: Can cap keep football players' heads in game? – Orange County Register
NFL players wear Guardian Caps to reduce head trauma during training camp
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
NFL players don Guardian Caps, designed to protect from concussion
What are Guardian Caps? NFL's latest padded helmets for added safety
NFL hopes to reduce head injuries with helmet experiment
What are Guardian Caps? NFL's latest padded helmets for added safety