Guardian Cap Debuts at Training Camps League-wide
Guardian Caps NFL: What player positions are required to wear them?
NFL Mandated Guardian Caps: Controversial Change - Sports Illustrated Seattle Seahawks News, Analysis and More
What is a Guardian Cap? Meet the NFL's newest safety measure
Packers share thoughts on wearing Guardian Caps at camp
Chicago Bears: Why players are wearing padded helmets
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
High school football looks to Guardian Cap for head safety
Seeking to reduce head contact, NFL mandates use of Guardian Cap helmet for early portion of training camp - ESPN
EXPLAINER: NFL using helmet caps for player safety, research
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
If a player wanted to wear a Guardian Cap during a game, the league would prohibit it
Garber Dukes to wear Guardian Caps during football practices
NFL players experiment with 'Guardian Caps' to protect heads