Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Is Aaron Rodgers America's most interesting athlete or its most annoying?, Aaron Rodgers
The story behind those soft-shell puffy Guardian Caps players have been wearing
NFL Mandated Guardian Caps: Controversial Change - Sports Illustrated Seattle Seahawks News, Analysis and More
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
[Smith] NFL says positions wearing Guardian Caps saw 52% decrease in concussions : r/nfl
At training camp, extra helmet padding is designed to reduce head trauma for Commanders players
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
Guardian Cap Debuts at Training Camps League-wide
New Orleans Saints players adjust to Guardian Caps during training camp
Packers LB De'Vondre Campbell on wearing Guardian Caps: 'I just think it's stupid'