Mattress: Get a 20cm orthopaedic memory foam mattress. Air circulation: With improved air circulation to help regulate the body temperature. Firmness: Features a medium firmness and is orthopaedic. Material: With 15cm high-density foam base and a 5cm top layer of memory foam. Cover: Comes with a removable zip-off luxury quilted cover. Size: Choose from seven sizes (see pricing below).