Slow memory polyurethane foam mattress containing a stiffened edge in high density polyurethane foam. It acts to relieve pressure on all the contact surface. This aim is achieved due to the intrinsic characteristics of the viscoelastic foam, provided with a slow memory (capacity of the material to adapt to a shape after having been deformed). This slow memory allow the adaptation to any body contour, maximising the support surface on the support, with a consequent reduction in contact pressure. The longer this characteristic lasts the more effective the pressure reduction on the skin is. The edge of the mattress makes it easier to move the patient from bed to a wheelchair. The device can be covered with a hypoallergenic polyurethane cover, impermeable to liquids and permeable to air, or a bielastic cover in polyurethane/polyamide which also reduces friction and rubbing between the skin and mattress. Material: Polyurethane foam in three densities HR30 (density 30kg/m3), LR50/4 (density 52-58 kg/m3) and HR 65 (density 60 kg/m3) Fire resistance: For HR foams MVSS motor vehicle safety std 302 California technical bulletin 117 (sec. A and D). CSE RF4 D.M. 23-06-84 UNI 9175/87 (classe M1) FAR 25853. Arrete du 28 AOUT 1991 Classement M4. Aribus ATS 1000.001. Non-fireproof L.R. foams. Conformity: Direttiva 93/42/CEE Warranty: 2 years (excluding the parts under wear and tear)