The classic, iconic Birkenstock Boston Shearling in Mink will satisfy all your winter needs. Plush shearling and a contoured cork footbed are guaranteed to cure your winter blues. Normal Width. Upper - mink suede. Footbed lining - cream shearling. Sole - EVA. Details - shearling, individually adjustable pin buckle in metal. Made in Germany. Weight - 20.8 oz.