The Be Well Mattress Protector is made of Pure Grow Wool™, an all-natural product that replaces synthetic foam and Dacron®. This wool is undyed and comes from sheep that graze in a pesticide-free pasture and eat feed that’s chemical-free. The Protector is highly moisture resistant, even enough for use in cribs, and is designed to lie flat on the mattress (with no straps). Because wool breathes, the Be Well Mattress Protector keeps you cool and comfortable, which comes as a surprise to some people who think the wool will make them hot. Because these mattress protectors are made by hand, they can vary slightly in size. Cold water washable; block or hang dry. Made in U.S.A.