Sleepwalk Memory Sprung Gold. Memory foam and open coil springs. The spring unit is 12.5 gauge, this is a spring grade designed to give you extra support with a firm feel. 20mm of memory foam on top molds to the shape of your body for great Nasa support. A soft knitted cover is micro quilted in place. This mattress is supplied vacuum packed and is rollable to ease of transport and storage. So buy this Sleepwalk Memory Sprung Gold Now £209.00.