From Birkenstock, the Women's Madrid Big Buckle High Shine Slide Sandals feature: Natural leather upper with a high shine finish Slip on design with adjustable oversized buckle strap Leather lining Classic contoured cork footbed supports the arches of the foot Deep heel cup for all day comfort EVA outsole Flat heel Imported. Styling Notes: Birkenstock footwear is made in European whole sizes. The style selected is a Birkenstock narrow footbed that will fit most medium feet.