You've made an investment in a natural mattress - why not protect your investment with a moisture barrier pad? This Holy Lamb Organics pad is made of tightly woven, slightly felted local Northwest Eco-Wool which is naturally water resistant. No more crinkly plastic or synthetic pads - this pad is made from all natural wool. The flat pad is placed right on top of your mattress and held in place by the fitted sheet. A great chemical-free solution to protecting your mattress!