Ravens Embrace the Funny-Looking Guardian Helmets - Sports Illustrated Baltimore Ravens News, Analysis and More
Guardian Cap used by football teams to protect against head injury – The Denver Post
EXPLAINER: NFL using helmet caps for player safety, research
Seeking to reduce head contact, NFL mandates use of Guardian Cap helmet for early portion of training camp - ESPN
Patriots, rest of NFL wearing cushioned helmet caps at training camp, per new mandate - CBS Boston
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
Chicago Bears: Why players are wearing padded helmets
Puffy Guardian Caps Could Reduce NFL Player Concussions
NFL players wear Guardian Caps to reduce head trauma during training camp
Guardian cap' to prevent head injuries mandated for practices, CFL says
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
PHOTOS: Texans wear new Battle Red helmets during training camp
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp