Duraspring System. Soft Feel. Fibre Fillings.The Quattro mattress is from Airsprungs gently supportive range it contains the duraspring spring system which is a 13.5 gauge spring system which is made with high tensile wire therefore giving an increased performance. The mattress has a softer flexible surface offering comfort and support for a good nights sleep. The Quattro mattress by Airsprung is suitable for a wide range of divan bases, or bedsteads that are available on our website.