An earpiece configured to be worn in an ear canal of a user is disclosed. The earpiece includes an adaptor having an interface configured to receive at least a part of a speaker unit and hereby be attached to the speaker unit. The earpiece includes an adaptable part, preferably a part made of a foam material or a gel material shapeable to fit the ear canal of the user. The adaptable part at least partly surrounds the adaptor. The adaptor has a sound outlet channel and at least one vent.