Guardian Caps: The new helmets worn by several NFL teams
NFL players wear Guardian Caps to reduce head trauma during training camp
NFL Mandated Guardian Caps: Controversial Change - Sports Illustrated Seattle Seahawks News, Analysis and More
Guardian Cap Use a Concern for Watt, Saleh Early in Training Camp - Sports Illustrated
Puffy Guardian Caps Could Reduce NFL Player Concussions
Guardian Caps leave some NFL players and coaches with concerns: 'You feel like a bobblehead'
What's with padded helmet caps teams are wearing
Seeking to reduce head contact, NFL mandates use of Guardian Cap helmet for early portion of training camp - ESPN
Chicago Bears: Why players are wearing padded helmets
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
Guardian Cap Debuts at Training Camps League-wide