Women's Birkenstock Madrid Brown Sandals - Flats The 'Madrid Big Buckle' style from Birkenstock is simple but stylish, featuring an up-scaled statement 'Birkenstock' branded buckle. The cork foot-bed has been contoured to conform to the shape of your foot - with arch support and and extra layer of cushioning for optimum comfort. Crafted from soft leather with a leather lining. Signature Birkenstock branding is seen throughout.