Coverage of the NFL in Guardian Caps
Carolina Panthers NFL helmets training camp
Concussions among players who wore Guardian Caps over summer dropped more than 50%, NFL says - ESPN
NFL training camps: Guardian Cap players are wearing over helmets, why
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
As NFL mandates Guardian caps in practice, area high school football teams have been using them for years, Sports
NFL hopes to reduce head injuries with helmet experiment - Seattle Sports
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
NFL players wear Guardian Caps to reduce head trauma during training camp