More padding the issue of concussions and better helmets
EXPLAINER: NFL using helmet caps for player safety, research
Guardian Caps, a soft-shell helmet cover, among CFL's new player-safety initiatives
Guardian Caps debut at NFL training camps around the league
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
NFL players experiment with 'Guardian Caps' to protect heads
NFL players don Guardian Caps, designed to protect from concussion
What are Guardian Caps? NFL's latest padded helmets for added safety
NFL exec suggests Guardian Caps worn to protect players during practices could one day debut in games
Ravens Embrace the Funny-Looking Guardian Helmets - Sports Illustrated Baltimore Ravens News, Analysis and More