Xaverian High in Mass. introduces Guardian Caps for football players
Guardian Caps debut at NFL training camps around the league
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
NFL Mandates Guardian Caps During Training Camp - Team Insight
NFL players don Guardian Caps, designed to protect from concussion
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
NFL Testing Safer Helmets
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
Packers share thoughts on wearing Guardian Caps at camp
What are Guardian Caps? Shadow Hills football using new device to reduce head injuries
Guardian Caps The Rundown
NFL says positions wearing Guardian Caps saw 52% decrease in concussions
What are Guardian caps? See the NFL's latest head protection device - Deseret News
NFL's top doctor does not expect Guardian Caps to be worn in games - NBC Sports
What are those funny-looking soft caps on NFL helmets during camp?, Sports