All Sunshine Mattresses are designed with a zippered outer cover made of 100% organic cotton and wool. Dual comfort means total control of your side of the mattress, so if you need your new organic adjustable mattress to be a little firmer or softer - no problem. Since all layers except the top are split down the middle, you can make whatever changes you need as your body changes, without affecting the other side! Simply unzip the cover and rearrange the latex layers inside. It really is a mattress for life!