A hearing aid with an earpiece for placement in the ear canal, and a dome, are disclosed. The earpiece comprises a speaker unit comprising: a receiver extending along an axis between an outlet surface perpendicular to the axis and a bottom surface perpendicular to the axis, a receiver outlet directed towards the ear canal of the user when the earpiece is mounted in the ear canal, a microphone having an inlet surface and a bottom surface, wherein the microphone is placed in connection with the receiver, a microphone inlet directed towards the ear canal of the user when the earpiece is mounted in the ear canal, wherein the receiver outlet is placed side by side with the microphone inlet, and wherein the microphone inlet and receiver outlet are separated by a wall, the earpiece further comprising a dome for placement on the speaker unit, the dome comprising: a speaker unit interface connecting a tip of the speaker unit to the dome such that when connected, the microphone inlet and receiver outlet are separated all the way into the ear canal, and an outer dome portion, wherein the dome comprises a two-component material in which the interface comprises a harder material, and the outer dome portion comprises a softer material.