This mattress features a 2.3/13 guage spring unit with a full 9 gauge wire edge and for extra support 10X9 gauge side wire edge strengtheners. A 100% pure cotton cover over 2 generous layers of high quality fillings and tufted surface with cotton daisies finish of this superb mattress. All fillings and cover comply to BS7177 Ignition Source 1.5 for medium contract use.