Our 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. The moisture barrier is designed to lay atop your mattress or topper and beneath a fitted sheet. We offer a size to fit any bed. For the little ones, our Puddle Pads are an essential item for crib, bassinet, and changing table.