I purchased these about three years ago, but I've only used them once or twice, so I'm putting them up for sale. If you have any other questions you'd like to ask, please feel free to comment. Below is information extracted from the product page. Please take a look. The Birkenstock Boston is a true classic that promises comfort all year round. The Boston, with its excellent functionality that allows you to freely adjust the fit, is already a legendary clog. The upper uses thick, high-quality oiled leather that takes advantage of the texture of the cut edges. *This product has significant individual differences due to the use of natural oiled leather. The color of the actual product may differ from the images on this site, but the color will gradually change to a darker shade like the images on the site through care with leather conditioner and repeated wear. Anatomically shaped natural rubber and cork footbed Upper: Oiled leather Insole: Suede leather Outsole: EVA Details: Strap with a metal buckle for individually adjustable fit “Made in Germany”