Guardian Caps Debut During NFL Minicamps
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
NFL hopes to reduce head injuries with helmet experiment – The Morning Call
FOOTBALL: NFL following Sequim's lead with protective caps
Queen's Football utilizing Guardian Caps - Queen's University Athletics
It's time the NFL made Guardian Caps mandatory
NFL players experimenting with 'Guardian Caps' to prevent head injuries
Guardian Caps leave some NFL players and coaches with concerns: 'You feel like a bobblehead'
More padding the issue of concussions and better helmets
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic