Ear muffs having an adjustable head band with ear pieces resembling a racing slick or monster truck tire. The ear pieces include removable hubcap discs on the outwardly facing sides thereof on which indicia may be applied in the nature of a race driver's name or the name of the racing establishment,...http://www.google.es/patents/US5509146?utm_source=gb-gplus-sharePatente US5509146 - Ear muffs
