More padding the issue of concussions and better helmets
NFL Mandate of Guardian Caps - 2023 Season >> Guardian Sports
Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries
Football helmet - Wikipedia
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
What are Glacier Peak players wearing on their helmets?
CFL players adjust to protective helmet caps
Guardian Caps: What are they and why are NFL players wearing them? - Sactown Sports
Football Guardian Caps XT (Current Model) – Guardian Sports
NFL Executive VP: League Saw 52 Percent Decrease In Concussions At Positions Wearing Guardian Caps - Steelers Depot
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN