Cochlear implant headpieces with improved moisture resistance. The headpiece comprises a housing (102) including a housing microphone aperture (124), a microphone (108) within the housing, a membrane (148) between the housing microphone aperture and the microphone, a cap (104) including a sound port (158) and a shield (168), the cap being removably connectable to the housing and the headpiece being protected from particulate and moisture ingress.
