(under subclass 171) Head coverings in which a crown wall, or an element forming a continuation of a crown wall, protrudes outwardly from the general crown contour in the head contact area to provide a space between the crown wall or element and the head, said space forming at least part of a through passage from the exterior of the head covering to the head.
SEE OR SEARCH THIS CLASS, SUBCLASS:
181.2+, for head coverings having a head- contacting means having only partial engagement with the head periphery to provide an open space between the head and a portion of the head covering.
182.1+, for head coverings having a gap between an inner face of the side of a crown and an opposed portion of a head contacting means to provide at least a portion of a through passage from the exterior of the head covering to the head.
