The Sareer Orthopaedic Memory Wool Matrah contains an open spring unit which provides you with excellent levels of support, as well as comfort. There are layers of non-allergy producing fillings to give you a clean and healthy night's sleep. Working in perfect harmony with the lower support layers, once you settle into your most comfortable position your body weight is redistributed reducing pressure whilst you sleep. This mattress contains Airstream Technology. Airstream has a number of clear advantages over traditional mattresses including: Fast cooling, low heat retention, durability, support and comfort.