The sound attenuation system for motor vehicles comprises a flexurally stiff foil (30), a spring layer (10) joined to the foil, and means (50) for attaching the foil and the partially compressed spring layer to the vehicle bodywork.

The lining part has a flat base section (2) with at least one aperture to accommodate an insert element, e.g. a foot mat (3). The aperture is closed by an end element on the back of the base section. The mat is fitted into the aperture in such a way, that ...