In metal coated in fireproof polyurethane foam. Backrest and seat are foamed separately and use polyurethane of different densities for enhanced comfort and softness in the seating area. Backrest of the semi-curved sofa is in structural polyurethane (BAYDUR® 60), coated in flexible fireproof polyurethane foam. Seat suspension provided by high- rubber-content elastic webbing. Backrest and seat casing in breathable heat-bonded fireproof fiber.