Pianosa Spring mattress is usable on one side only. Medium load-bearing capacity and designed by Poltrona Frau. Self-molding; Non-deformable; Breathable and ventilated; Naturally correct sleeping position; Non-removable cover.Composition.1. Natural hemp. Anti-mite, Jacquard weave.2. Staple cotton heat-diffusing All Seasons filling.3. Protective layer.4. Anti-humidity micro-perforated insulation for perfect breathability in non-deforming, high-density expanded POLYCELL.5. Compact white insulation in carded, needled, heat-fused fibres.6. Bonnel spring system with medium load-bearing capacity composed of approximately 450 biconical springs for the double bed. The springs, made of tempered carbon steel wire with a diameter 2.2 mm, are connected by carbon steel wire spirals with 1.3 mm diameter.7. Perimeter box support system in non-deforming, high-density, expanded POLYCELL, micro-perforated, and anti-humidity.8. Cotton fabricMatching bed bases. Vespero.As a pocket spring mattress, it is not particularly suited to the movement of a manual or electric frame. It goes naturally with a fixed frame