Every Manduka eKO mat is made from biodegradable, 100% natural tree rubber with non-toxic foaming agents and non-azo dyes, we use no PVC or harmful plasticizers and all post-industrial scrap is thoughtfully collected and utilized in the production of other materials creating a zero waste manufacturing process. To store, roll your eKO mat with the top side facing outwards. This keeps the corners of the mat flat when practicing. The surface texture of Manduka mats improves with use.