Heads up: Guardian Caps draw mixed reviews from NFL players, Sports
MeCCO Monthly Summaries :: Media and Climate Change Observatory
NFL players experimenting with 'Guardian Caps' to prevent head injuries
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
2010 Army Football Guide by Army West Point Athletics - Issuu
Football - The Daily Tar Heel
EXPLAINER: NFL using helmet caps for player safety, research
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Guardian Cap Results: “Exceeded Our Expectations”
Oklahoma Sooners Continue to be Proactive in Player Safety With Guardian Caps - Sports Illustrated Oklahoma Sooners News, Analysis and More
Football - The Daily Tar Heel