Here's why some Patriots players are wearing caps over their helmets during training camp
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
Guardian Cap Debuts at Training Camps League-wide
Guardian Cap Debuts at Training Camps League-wide
Why are players wearing padded helmets at NFL training camps?
NFL's stern stance on concussion-preventing helmets, revealed
NFL executive: Guardian Caps could one day be used in games
Guardian Caps NFL: What player positions are required to wear them?
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
Get A Load Of These Big Dumb Helmet Helmets
Packers share thoughts on wearing Guardian Caps at camp