I had not heard of this item before and it might prove useful for restoring some of my handspun yarns that are in the natural state,not dyed, which I often work with as I am a spinner as well as a knitter. However, for wool I've purchased that is commercially spun and dyed, I also use Eucalan for the reasons mentioned in Knitknut's post. I like the smell also-very light, not perfumey and it really softens the wool so that it can be worn next to the skin.