Chicago Bears Helmets, Bears Mini Helmets, Collectible Helmet
Chicago Bears 1962-73 Throwback Pro Line Helmet - Sports Fan Shop
The story behind those soft-shell puffy Guardian Caps players have been wearing
Seeking to reduce head contact, NFL mandates use of Guardian Cap helmet for early portion of training camp - ESPN
Why Alabama football players are wearing padded helmets in practice
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Chicago Bears Riddell SpeedFlex Helmet – Green Gridiron, Inc.
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
Opinion: The Detroit Lions are the template, and the Chicago Bears should follow suit
Chicago Bears: It seems the battle for center is over before it even begins