What are Guardian Caps? NFL's latest padded helmets for added safety
More padding the issue of concussions and better helmets
Guardian Caps Guardian Sports
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
A closer look at the rule changes the NFL is debating - The Washington Post
Coverage of the NFL in Guardian Caps
This might be a dumb question, but why do they wear these extra pads on their helmets for camp but remove them for games? : r/KansasCityChiefs
What are Guardian Caps? Shadow Hills football using new device to reduce head injuries
Guardian Caps: NFL's hotly debated new safety measure here to stay?
NFL hopes to reduce head injuries with helmet experiment
NFL players wear Guardian Caps to reduce head trauma during training camp