^[1]The Cool Hard Hat, manufactured by a company with the same name, uses two battery-powered fans to blow 8 cubic feet of air across the top of the wearer’s head and neck. This airflow provides cooling as it moves the heated air away from the head, allowing the body to cool itself naturally. Benefits include more comfort, less perspiration on the head and neck, and a reduced risk of heat stress or heat stroke. The Cool Hard Hat is said to lower the temperature inside the hard hat by as much as 20 degrees.