Guardian Caps, a soft-shell helmet cover, among CFL's new player
NFL report: concussions dropped 50 PERCENT when players wore new
NFL Mandated Guardian Caps: Controversial Change - Sports
Guardian Caps added to help reduce football concussions - The
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
Guardian Caps - Are the soft-shelled football helmet covers
Puffy, spongy Guardian Caps could help curb NFL head injuries
Guardian cap' to prevent head injuries mandated for practices, CFL
Guardian cap' to prevent head injuries mandated for practices, CFL