An ear bud or dome comprising, in a rest position, the rest position being a position where the ear bud is not stressed or deformed, thereof: - a central portion (12, 112, 212) comprising therein a channel defining a central, longitudinal axis, the central portion having a first end and a second end, - a plurality of convex elements (14, 16, 18, 20, 120, 211) extending away from the central portion, a maximum distance being a largest distance, perpendicularly to the longitudinal axis, from the longitudinal axis to any portion of a convex element, where the convex elements are positioned so as to have, in a cross section perpendicular to the longitudinal axis, a space between neighbouring convex elements, characterized in that: - all first portions of the convex elements positioned at least 30% of the maximum distance from the longitudinal axis are soft and take up a total angle, seen from the longitudinal axis and when projected on to a plane (A, B) perpendicular to the longitudinal axis, of at least 120 degrees, - all convex elements, when projected on to said plane, take up a total angle of no more than 350 degrees and that - each convex element has, at longitudinal positions along the longitudinal axis of the first portions, in a cross section in a plane perpendicular to the longitudinal axis, have a contour which: - when viewed from a position inside the cross section, is concave in all directions and - if the convex element engages the central portion in the cross section, the contour, when viewed from a position inside the cross section, is concave in all directions not directed toward the central portion. - a central portion (12, 112, 212) comprising therein a channel defining a central, longitudinal axis, the central portion having a first end and a second end, - a plurality of convex elements (14, 16, 18, 20, 120, 211) extending away from the central portion, a maximum distance being a largest distance, perpendicularly to the longitudinal axis, from the longitudinal axis to any portion of a convex element, where the convex elements are positioned so as to have, in a cross section perpendicular to the longitudinal axis, a space between neighbouring convex elements, characterized in that: - all first portions of the convex elements positioned at least 30% of the maximum distance from the longitudinal axis are soft and take up a total angle, seen from the longitudinal axis and when projected on to a plane (A, B) perpendicular to the longitudinal axis, of at least 120 degrees, - all convex elements, when projected on to said plane, take up a total angle of no more than 350 degrees and that - each convex element has, at longitudinal positions along the longitudinal axis of the first portions, in a cross section in a plane perpendicular to the longitudinal axis, have a contour which: - when viewed from a position inside the cross section, is concave in all directions and - if the convex element engages the central portion in the cross section, the contour, when viewed from a position inside the cross section, is concave in all directions not directed toward the central portion. - all first portions of the convex elements positioned at least 30% of the maximum distance from the longitudinal axis are soft and take up a total angle, seen from the longitudinal axis and when projected on to a plane (A, B) perpendicular to the longitudinal axis, of at least 120 degrees, - all convex elements, when projected on to said plane, take up a total angle of no more than 350 degrees and that - each convex element has, at longitudinal positions along the longitudinal axis of the first portions, in a cross section in a plane perpendicular to the longitudinal axis, have a contour which: - when viewed from a position inside the cross section, is concave in all directions and - if the convex element engages the central portion in the cross section, the contour, when viewed from a position inside the cross section, is concave in all directions not directed toward the central portion. - when viewed from a position inside the cross section, is concave in all directions and - if the convex element engages the central portion in the cross section, the contour, when viewed from a position inside the cross section, is concave in all directions not directed toward the central portion.