Memory Luxe. This entry level memory foam mattress features 25mm of memory foam on top of a 13.5 gauge open coil spring system. The steel rod edge extends the sleeping surface to the mattress edge and minimises side sagging, a major problem among even expensive open coil mattresses. It has a soft touch stretch micro quilted cover and comes with a 1 year guarantee. So buy this Memory Luxe Now £139.00.