EXPLAINER: NFL using helmet caps for player safety, research
NFL: Concussions dropped by more than 50% among players who wore
NFL's use of Guardian padded helmet caps in camp draws support and
NFL Mandated Guardian Caps: Controversial Change - Sports
Guardian Cap: What are and why the NFL asks this safety measure in
NFL players beginning to adopt protective Guardian Caps over
Guardian Cap debuts during minicamps in effort to reduce avoidable
NFL players don Guardian Caps, designed to protect from concussion
Padded helmet cover shows little protection for football players
NFL players wear Guardian Caps to reduce head trauma during