49ers' George Kittle contends with Chargers' Derwin James; Deebo Samuel has MRI
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
NFL's top doctor does not expect Guardian Caps to be worn in games - NBC Sports
The safety story behind the unusual helmets NFL players are wearing this summer - OHS Canada MagazineOHS Canada Magazine
Maiocco's 49ers camp observations: Lance, QBs make defense pay
NFL players don Guardian Caps, designed to protect from concussion
Complaints begin regarding Guardian Caps, despite one important hidden benefit - NBC Sports
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
Raiders, other NFL teams wear Guardian Caps for head safety, Raiders News
Why are players wearing padded helmets at NFL training camps?
Guardian Caps NFL: What player positions are required to wear them?
NFL players don Guardian Caps, designed to protect from concussion
Why are NFL players wearing padding on helmets at training camp?