Helmet

a piece of defensive armor for the head; a defensive covering for the head. It was originally made of leather, and afterward strengthened by the addition of bronze and other metals, till finally it was constructed entirely of metal, lined with felt or wadding. In the Middle Ages helmets were frequently inlaid with gold, and provided with bars and movable flaps to cover the face in battle, and to be opened at other times. In the United States helmets are worn by firemen to protect them from falling pieces of a wood, when ext in fires. In tropical countries elmets are made of soft white felt, wrapped round with folds of linen, to protect the head of the wearer from the heat of the sun.