An improved ear tip for earphones and hearing protection is provided where comfort and occlusion of the ear are of most importance. The ear tip comprises an elastomer polymer resin material molded to form the material to the shape of the ear canal. A chamber is defined having a proximal and distal end,...http://www.google.es/patents/US8201561?utm_source=gb-gplus-sharePatente US8201561 - Ear tip
