The Sleepwalk Memory contains an open coil spring system and a layer of memory foam. The 12.5 gauge spring unit is extra supportive and delivers a firmer feel. With 20mm of memory foam on top, the mattress moulds to the contours of your body to alleviate pressure and improve your circulation. A soft, knitted cover is micro quilted in place to render a smooth sleeping surface. This mattress is supplied vacuum-packed for easy installation.