The trim (17) comprises a soft outer skin (51). It comprises a plurality of protrusions (53) which are integral with the outer skin (51) and are to rest on a frame (13) for supporting the component (11). Each protrusion (53) extends from an inner face (57) of the skin (51). The protrusions (53) delimit between them spaces (55) for deformation of the trim (17). The ratio of the thickness (ep) of the skin (17), taken orthogonally to the inner face (57), to the thickness (es) of each protrusion (53), taken along the inner face (57), is greater than 2. The ratio of the thickness (ep) of the skin (17) to the minimum distance (dn) separating each pair of facing protrusions (53A, 53E), taken along the inner surface (57), is greater than 0.3.