The N.F.L.'s Incredible Shrinking Pads - The New York Times
The Guardian Cap is an example of the NFL's continued work to foster innovation that leads to better, safer protective equipment for…
How did your NFL team gets its name? Origins explained for all 32 - ESPN
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
How Helmets Have Evolved to Prevent Football Concussions - Chester County Hospital
American Football Explained
NFL studying helmet face guard that works like surgical mask
PFF50: The 50 best players in the NFL right now, NFL News, Rankings and Statistics
College football is the farm system for the NFL. Why are taxpayers funding it? - Los Angeles Times