Available in a range of sizes to suit any preference the memory shire sovereign 40 mattress features a luxurious 40mm of memory foam in addition to 800 pocket springs and generous layers of fillings including reflex foammemory foam is designed to conform to the body providing support for pressure points and encouraging correct spinal alignment while you sleep denser than normal foam it adjusts to your body to create the ideal sleeping surfaceplease note spring count refers to a 5ft kingsi