The reason we chose wool is twofold. First off: wool regulates the heat and moisture. As opposed to the other materials, wool is capable of emitting heat when it gets hot and sweaty underneath the duvet. Down only isolates, so is often too hot. In addition, wool contains lanoline, which is self cleaning and makes our products hypoallergenic: dust mites don't stand a chance. Read more about the beneficial properties of wool on our inspiration page.