The Bauer Official's protective shirt offers 37.5 liner technology. The chest is protected with Bauer's XRD foam layered into the perforated foam. The 37.5 technology incorporated into the protective shirt will sure keep you cool and dry on the ice by helping to turn sweat into energy. The lightweight, perforated foams used by Bauer to protect key areas of the body such as the sternum, spine, and ribs will do its job while allowing more maneuverability. The chest is protected with Bauer's XRD foam layered into the perforated foam.