Birkenstock Tokio Shearling Sandals in Mink. A closed-toe silhouette with a suede upper, this Birkenstock Tokio is designed with a Shearling lining and a nubuck leather rear strap. Featuring a cushioned EVA sole and an anatomically shaped cork-latex footbed, this brown Birkenstock Tokio sandal is finished with adjustable buckles and woven flag labels.