Can new technology help cut down on concussions? (video)
Guardian cap' to prevent head injuries mandated for practices, CFL says
EXPLAINER: NFL using helmet caps for player safety, research
Guardian Caps: Why some NFL players are wearing them in training camps
So what exactly is that black padding on the Syracuse football helmets seen during practice?
Arizona Cardinals' J.J. Watt critical of Guardian Cap: 'Feel like a bobblehead' - ESPN
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
Guardian Caps Guardian Sports
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure