This is the cover that contains three, three-inch layers for a total of a nine inch thick mattress. This cover is "organic" cotton. "Organic" in the textiles industry is primarily a marketing term and such is the case here. Though our covers say "Organic Cotton" on them, it is less than twenty percent organic cotton fibers. This also contains fifty percent polyester. Some will say, why not organic cotton or wool since you are offering certified organic GOLS latex? Good question! The reason is fairly simple. Very little textiles that advertise organic, are really organic. Second, we believe in the terrific utility of the benefits of a stretch knit fabric that will allow the latex to mold and support the sleeper's body perfectly. So, the polyester makes this possible and makes this bed washable. We hop this makes sense.