Mat in rolls composed of granules and selected SBR rubber combined with polyurethane resins (MDI) with a density up to 550kg/m3. The material has an optimal elasticity and mechanic resistance that assures long life and constant acoustic performances. Impact sound insulation on floors thanks to the floating screed system or a dBred Piano Zero under flooring system with elastic layer directly glued under ceramic or wooden floorings. It can be used for the vibration isolation in general interposing it among planar surfaces.