Duoform XM is an ultra-soft mattress, covered with the latest type of fabric: Outlast, a highly technological fabric made of a structure of spheres which are made up of a special wax that dilates while you're sleeping if the temperature rises excessively and therefore, improves the passage of air thereby creating the suitable micro-climate. When the ideal temperature is reached the spheres become more consistent and maintain the temperature. A 2cm ultra soft layer of memoform magnifoam is quilted to this fabric, and another 3cm internal layer gives extra comfort! The Eliosoft layer, a high density and breathable material gently supports the body, giving the correct balance between rigidity and softness.