Latex Mattress Double XL Foldable Characteristics of mattress materials:Natural and eco-friendly The natural latex is the liquid that flows out from rubber trees with a certain age at a specified time. The latex is milky white, with a solid content of 30%-40%, and the rubber particle size is 1.06 microns on average. And the latex mattess is made from natural latex, with newest physical foaming technology. Its service life is longer.