There are two methods used to manufacture latex, the Dunlop process and the Talalay process. The Dunlop process has been in use for over 90 years, the Talalay process is a much newer process introduced within the last few years. The Dunlop latex process is normally used to manufacture 100% pure and natural latex from the sap of the rubber tree. The Talalay latex process is more often used to combine natural and synthetic latexes, usually with 70% natural latex and 30% synthetic rubber, or to combine natural latex with fillers made from inert raw materials to bulk out the latex foam. It’s a whole lot cheaper to make latex padded out with fillers, and a whole lot more profitable for the manufacturer who makes it. Our 100% pure and natural latex products do not use synthetic fillers.