Coverage of the NFL in Guardian Caps
EXPLAINER: NFL using helmet caps for player safety, research
Guardian Caps debut at training camps throughout NFL
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
These puffy helmet caps are the next big thing in NFL player safety, National Sports
NFL hopes to reduce head injuries with helmet experiment
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
NFL training camps: Guardian Cap players are wearing over helmets, why
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
Guardian Caps: Why some NFL players are wearing them in training camps
Truth About Guardian Caps
Puffy Guardian Caps Could Reduce NFL Player Concussions
Here's why some Patriots players are wearing caps over their helmets during training camp