What is a Guardian Cap? Meet the NFL's newest safety measure
Bellmore-Merrick athletics debuts new guardian caps, Herald Community Newspapers
Guardian Caps a fit for Park Wolfpack - Cottage Grove Journal
Guardian Caps Guardian Sports
NFL players experimenting with 'Guardian Caps' to prevent head injuries
Guardian Caps Debut During NFL Minicamps
NFL players wear Guardian Caps to reduce head trauma during training camp
NFL hopes to reduce head injuries with helmet experiment
NFL players experiment with 'Guardian Caps' to protect heads - The San Diego Union-Tribune
NFL hopes to reduce head injuries with helmet experiment