It protects your body against temperature changes due to its natural texture made of goose feather, regulates humidity and creates a favorable atmosphere for a sleep. It is 'hygroscopic'. In other words, it absorbs sweat of the body at night and sprinkles that sweat to the air during the day. When the pillow and quilt are shaken and aired once a month, filling of them get loose and they purified from humidity by puffing up again. It doesn’t produce smell since it doesn’t keep bacteria.