This superbly comfortable mattress is available in two different spring options you can choose between the slightly firmer open coil spring system and the super luxury of pocket springs each one has a thick layer of memory foam on top of the spring open coil details middot 135 gauge double heat treated open coil spring unit middot flag stitch handles for ease of lifting middot ventilators to help the mattress breathe middot thick layer of high grade visco elastic memory foam middot