what is pollard wearing around his neck

Tony Pollard, a running back for the Dallas Cowboys, wears a medical device called the Q collar around his neck. The Q collar is a small, lightweight necklace-type device that applies slight pressure to the wearers internal jugular vein. It helps reduce brain injuries such as concussions by increasing the volume of blood in the skulls blood vessels, which creates a tighter fit of the brain inside the skull and reduces the harmful internal movement that causes brain injury. The Q collar is a non-invasive device that fits securely around the neck and is intended to protect athletes brains during head impacts.