Alex Rodriguez: cheat, liar, egomaniac and baseball's savior, MLB
Guardian Caps Guardian Sports
Guardian Cap: What Are And Why The NFL Asks This Safety, 40% OFF
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
September 2013 – The Concussion Blog
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
Nursing Professor's Passion Inspires Immersive Study Abroad Program : Florida Atlantic University
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN