Coverage of the NFL in Guardian Caps
What is a Guardian Cap? Meet the NFL's newest safety measure
Guardian Caps: NFL requires use of helmet cover at training camps
NFL Players Experiment With 'Guardian Caps' to Protect Heads – NBC
Carolina Panthers NFL helmets training camp
NFL CMO Dr. Allen Sills explains importance of mandated guardian
NFL Testing Validates Benefit of Guardian Cap on Helmets
NFL hires Dr. Allen Sills as full-time chief medical officer
Seeking to reduce head contact, NFL mandates use of Guardian Cap
Shawne and Allen Sills, NFL chief medical officer, named Heritage