Guardian Caps Guardian Sports
Guardian Cap Debuts at Training Camps League-wide
Football Guardian Caps NXT (NFL Model)
CFL players adjust to their bigger heads, helmet covers worn in practice
Guardian Caps, a soft-shell helmet cover, among CFL's new player-safety initiatives
NFL Presents: League-wide Guardian Cap Use to Reduce Head Impacts
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Guardian cap' to prevent head injuries mandated for practices, CFL says
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Guardian Cap Results: “Exceeded Our Expectations”