From the Toots LeBlanc & Co website:

This Angora blend yarn is a combination of the Angora rabbit blended with a soft, sheep wool. We have tried, when possible, to use rare-breed sheep wool. However, because they are rare breeds, it is not always easy to come by good, top quality wool of a specific rare-breed sheep. So, for the sheep wool in this blend, we have used wool from either the Rambouillet or the Merino sheep. Both have wool that is very soft, and has a high-crimp, spring and loft.