Muffe til et ørestykke til et høreapparat og et høreapparat med et ørestykke og med en udskiftelig, sammentrykkelig muffe af et polymerskumplast

Detachably secured to the ear piece (11) of a hearing aid is a user-disposable sleeve (13) comprising soft polymeric retarded recovery foam (14) that can be compressed to be freely insertable into a person's ear canal and then allowed to recover to become wedged in the canal. The sleeve preferably includes a flexible, elongated plastic duct (16) over which the foam fits, and the duct is formed with a screw thread of a rigid plastic which mates with a screw thread on the ear piece for each attachment and removal. The external surface of the foam preferably is substantially cylindrical and can be formed with flutes (26) to provide venting of the user's ear.