I expect a "Boiled Wool slipper" to have wool lining..I don't mind OTHER 'fabrics' on the Outside..
But try saying "Faux Shearling  with thin wool exterior" and Acorn name won't be enough.
They seemed warm in a cold floored home. But then I noticed odor and sweat..and even odor ..
and that never happened with real Shearling or anything using actual sheep descriptions.
I gave a high 4 stars to get my experience seen closer to the 'happy' votes..maybe from warmer climates and less daily use. Well it time to wash the faux wool liners.. Real wool seldom needs odor treatment..And my just showered feet simply don't create odor after a few weeks of wear. even slipped on after 10 hour work day..into my aging wools..they are longterm, still-  decent standbys.