NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer
Puffy helmets make life safer for young athletes
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
What are Guardian Caps? NFL's latest padded helmets for added safety
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
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
Guardian Caps — Do They Work? - The Indiana High School Football Forum - The Gridiron Digest
What are Guardian Caps? NFL's latest padded helmets for added safety
What are Guardian Caps? Shadow Hills football using new device to reduce head injuries