I was under the impression based on the description that these were shearling -made of sheep hide with the fleece still attached.  They are not, and I don't think they are worth the $40 I paid.  While the outside is suede, it is of low quality, as is the rubber sole: thin and flimsy.  The linning is a laminated layer of wool adhered to a poly fabric.  The wool inside comes off and compresses down to nothing.  They resemble the quality you might buy at a drug store.  All that said, they do get the job done for what they are.  One good feature is the ankle flaps can be flipped up to form more of a bootie.  Be warned, they are not genuine shearling