The purpose of this product is to protect your mattress naturally from the everyday wear and tear. Made with slightly felted and tightly woven wool that is naturally water repellent. The napped surface absorbs moisture and keeps dampness from getting through. So whether it's sweating or children in the bed who sometimes go in the night- you're covered. This is an essential item for parents of little ones. Available in bassinet all the way to king sizes. Made with thick, felted 100% woven organic wool textile. It lays flat on top of the mattress without straps and is held in place by the fitted sheet. This is a natural replacement for a vinyl plastic or synthetic mattress cover. "Note that there is a 10% restocking fee for all Holy Lamb Organics returns."