What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
Guardian Caps: The new helmets worn by several NFL teams
Top Equipment To Protect Your Players - Coach and Athletic Director
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Guardian Cap Debuts at Training Camps League-wide
Oklahoma Sooners Continue to be Proactive in Player Safety With Guardian Caps - Sports Illustrated Oklahoma Sooners News, Analysis and More
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets