Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
NFL players experiment with 'Guardian Caps' to protect heads – The Oakland Press
What are NFL players wearing on their helmets at training camp and how do they work? - The Mirror US
Ravens Embrace the Funny-Looking Guardian Helmets - Sports Illustrated Baltimore Ravens News, Analysis and More
The story behind those soft-shell puffy Guardian Caps players have been wearing
Puffy Guardian Caps Could Reduce NFL Player Concussions
What are the padded helmets players are wearing at NFL training camps?
Guardian Caps debut at training camps throughout NFL
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL hopes to reduce head injuries with helmet experiment
NFL Mandated Guardian Caps: Controversial Change - Sports Illustrated Seattle Seahawks News, Analysis and More
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
PHOTOS: Texans wear new Battle Red helmets during training camp