What are Guardian Caps? Shadow Hills football using new device to
Guardian Caps: What are they and why are NFL players wearing them
Guardian Caps: Why some NFL players are wearing them in training camps
Padded helmet cover shows little protection for football players
Ravens Embrace the Funny-Looking Guardian Helmets - Sports
Xaverian High in Mass. introduces Guardian Caps for football players
No Pads Yet, But Jonathan Gannon Still Has Goals
Why are NFL players wearing padding on helmets at training camp?
Puffy, spongy Guardian Caps could help curb NFL head injuries
Guardian Caps leave some NFL players and coaches with concerns