Guardian Caps Guardian Sports
SBJ Closing Bell: NFL makes ambitious direct-to-consumer move
Football helmet padding reduces concussions
Park High School football blazes safety trail with Guardian Caps
Guardian cap' to prevent head injuries mandated for practices, CFL says
Guardian Cap Use a Concern for Watt, Saleh Early in Training Camp - Sports Illustrated
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
NFL, NFLPA working hard to improve player safety
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post