(EO) - essential oils or natural extracts typically from plants and herbs. None of the scents in this selection use chemical fragrances. A great choice for those sensitive to chemical fragrances. (FO) - fragrance oils typically are chemically derived fragrances manufactured to replicate scents. Great for fragrances that can't otherwise be added to products and for those with sensitivities to essential oils. A few puffs of lanolin-rich foam and you are ready to wash your wool covers. This 8ounce bottle will last a long time. Lots of lanolin so you don't have to lanolize your covers as often. Gentle foam is easy on your wool items.