What are those funny-looking soft caps on NFL helmets during camp?, Sports
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Safety first: Lopers to wear padded caps in practice to prevent concussions
Ohio State Aiming To Reduce Head Injuries With Guardian Caps - Sports Illustrated Ohio State Buckeyes News, Analysis and More
Giants react to NFL's new 'Guardian Caps' at training camps - Big Blue View
Arizona Cardinals defensive end J.J. Watt not fan of the new league-mandated Guardian Caps on helmets
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
Garber Dukes to wear Guardian Caps during football practices
What's with padded helmet caps teams are wearing
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL exec suggests Guardian Caps worn to protect players during practices could one day debut in games
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
Guardian Cap: What are and why the NFL asks this safety measure in helmets
Why guardian caps are now part of practice helmets for certain Titans
High school football looks to Guardian Cap for head safety