The parma foam mattress contains a layer of memory foam which was originally made by nasa this mattress reacts to pressure moulding to the contours of your body to ensure excellent pressure relieving supportdimensionssmall single l 190cm x w 75cm x h 18cmsingle l 190cm x w 90cm x h 18cmsmall double l 190cm x w 120cm x h 18cmdouble l 190cm x w 140cm x h 18cmking l 190cm x w 150cm x h 18cm