What Are the Experts Saying About Guardian Caps – The Concussion Blog
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
Shell game: Player safety looming concern as new season approaches, Local Sports
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
NFL announces more steps to reduce head injuries
Football helmet - Wikipedia
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
What are Guardian Caps? NFL's latest padded helmets for added safety
Why Alabama football players are wearing padded helmets in practice
What are Guardian Caps? NFL's latest padded helmets for added safety
Football helmet - Wikipedia
So what exactly is that black padding on the Syracuse football helmets seen during practice?
What are Guardian Caps? NFL's latest padded helmets for added safety
Rethinking Turf From The Ground Up
NFL expands rule against misuse of helmet; Guardian Caps required in regular season, postseason