The reason for that is that, if I understand correctly, Wolverine used to use all of the layers of the shell area, and not just the middle layer that we today use for shell cordovan. There's an epidermis layer above and below the shell membrane. Wolverine used all 3 layers in their work boots. As seen in the old advertisements, they talk about the 3 ply leather (inner layer, inner shell, outer layer).
5/27/15 at 6:13pm