Memory 250 memory foam mattress is an orthopaedic mattress with sanitised fabric and hypo allergenic makes perfect for restful nights type memory foam features memory 250 memory foam mattress it is made from unique upper layer of high density visco elastic polymer gel which is heat and pressure sensitive it gives an elastic ability which allows it to conform to your body shape to relieve pressure points across the body this improves blood circulation and improves your sleep it provides