Firm Latex on top of Firm Latex. Enough said, this is a Firm Latex mattress. If you want Latex, and want it Firm, then the Wash Park Firm is your new mattress. 6″ Firm Organic Dunlop Latex, on top of 6″ of Firm Organic Dunlop Latex ensures you get proper support, and optimum firmness. An Organic Cotton Cover is placed immediately on top of the latex, with no additional quilting layers, ensuring you get the most benefit from the latex. All Natural Latex is made from the sap of the rubber tree, is sustainable, extremely durable, and provides no motion between sleeping partners.