The Natural Sleep Ortho mattress contains an orthopaedic open coil spring unit which provides excellent levels of support, as well as comfort. It has layers of traditional hypo-allergenic fillings including reflex foam. The layer of reflex foam largely contributes to the firmness rating of the mattress while the other layers offer enhanced comfort and luxury. Reflex foam is made up of tiny holes that slightly adapt to your body shape but bounce back against you at the same time. The high-density foam is naturally hypoallergenic and durable. Flexible and responsive, the mattress provides healthy spine alignment and back support. For a luxurious touch the Natural Sleep Ortho is finished with a soft stretch knit fabric with an organic look and modern embossed design. Finished with a stylish 3D border in chenille grey which allows air circulation and means that air flow is regulated and breathable through the night, ensuring ultimate comfort.