Guardian Sports - The Science Behind The Guardian Cap
Guardian Caps - Are the soft-shelled football helmet covers
NFL training camps: Guardian Cap players are wearing over helmets, why
Guardian Cap - Soft-Shell Helmet Cover for Football and Lacrosse - Reduces Impact and Protects Helmets - One Size Fits All for Youth, High School
Guardian cap' to prevent head injuries mandated for practices, CFL
Guardian cap' to prevent head injuries mandated for practices, CFL
Reduces impact up to 33% One size fits all Insulates in hot & cold weather Fits both football and lacrosse helmets Connects to the facemask with 4
Guardian Protective Helmet Cover
NFL 2017 Health & Safety Report
Video: CFL players adjust to protective helmet caps - The Globe
NWT Guardian Cap Soft-Shell Protective Helmet Cover Navy
Guardian Cap - Soft-Shell Helmet Cover for Football
NFL Players Experiment With 'Guardian Caps' to Protect Heads – NBC
Why the Ticats are wearing those giant helmets at practice