This organic wool moisture pad by Hom Organics is made of Oregon Tilth Certified Organic Wool. It provides excellent protection for your mattress. The wool is naturally water repellant. Works best when layered with an organic cotton mattress pad. All sizes (except crib) have corner straps to help it stay in place. Sewn and packaged by a co-op of women who work out of their homes in Boulder, Colorado. Wash in cold water and hang to dry for best results.