Coverage of the NFL in Guardian Caps
The story behind those soft-shell puffy Guardian Caps players have been wearing
High school football teams go soft in the fight against brain injuries
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries
A closer look at the rule changes the NFL is debating - The Washington Post
Do padded helmet covers actually protect football players? - Futurity
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
The story behind those soft-shell puffy Guardian Caps players have been wearing
Puffy Guardian Caps Could Reduce NFL Player Concussions