Seeking to reduce head contact, NFL mandates use of Guardian Cap
Guardian Cap debuts during minicamps in effort to reduce avoidable
EXPLAINER: NFL using helmet caps for player safety, research
NFL mandates extra head protection for training camp
Why are NFL players wearing padding on helmets at training camp?
NFL exec suggests Guardian Caps worn to protect players during
Guardian Caps: NFL requires use of helmet cover at training camps
Puffy, spongy Guardian Caps could help curb NFL head injuries
Guardian Caps Guardian Sports
Players, coaches react to mandatory use of Guardian Caps
Guardian Cap Debuts at Training Camps League-wide