NON-REMOVABLE INSOLE. Sulcus Orthotic Recommended. Foot Lining is made of Sheepskin Shearling. Outside Material consists of Cowhide Suede. The sole was developed by Vibram, the world's leader in sole technology, who used their 70 years of history and a rugged TC1 compound to provide a durable, low profile sole that could also serve as a canvas for an Aboriginal Story. The artwork and story on the sole was created by an aboriginal artist in WInnipeg, Canada. *Manitobah Mukluks are handmade. As a result, they may vary slightly in colour and beading.