As NFL mandates Guardian caps in practice, area high school football teams have been using them for years, Sports
What are Guardian Caps? Shadow Hills football using new device to reduce head injuries
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
What is a Guardian Cap? Meet the NFL's newest safety measure
Could Guardian Caps be used in games? - NBC Sports
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
Staples football pioneers use of 'Guardian Caps'
College Football & Guardian Caps // Guardian Sports
Sport Supply Group 1390089 Guardian Protective Helmet Cover, Vegas Gold
Guardian Caps are the latest effort to address CTE, football concussion concerns
More teams practicing with Guardian Caps, Sports
NFL rejects polyurethane safety caps for football helmets
Robert Saleh dislikes the new Guardian Caps: And he has a point
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
NFL players experiment with Guardian Caps // Guardian Sports