Holy Lamb Organics 100% natural moisture barrier is created without fillers or additives, making this woven wool textile the perfect chemical-free solution for mattress and topper protection. The wool is tightly woven and slightly felted, resulting in a naturally water repellent fabric that’s a healthy and eco-friendly alternative to synthetic products. Our Puddle Pads are an essential item for little ones and growing youngsters. The moisture barrier lays flat atop the mattress and is held in place by the fitted sheet. Puddle Pads work best in tandem with a thin cotton blanket placed on top of the pad and under the fitted sheet. The cotton layer soaks up the moisture quickly while the moisture barrier prevents it from absorbing through to the mattress.