The Birkenstock Women’s Madrid Big Buckle Sandal is after party ready. A smooth, velvety upper gives the Madrid a subtle shimmer for the season. The soft pink style pairs perfectly with a shiny, oversized buckle and tonal, smooth leather footbed for a luxe look inside and out. Complete with go-all-night comfort from the original contoured BIRKENSTOCK footbed. Contoured cork-latex footbed creates custom support with wear Smooth, velvety upper Footbed lined with smooth leather EVA sole is flexible and lightweight Adjustable strap with oversized metal pin buckle “Made in Germany” quality stamp on footbed UPPER: VELVET INSOLE: NATURAL LEATHER Natural leather can be recognized by its untreated surface. BIRKENSTOCK purposely does not treat surface grains and other characteristic features. BIRKENSTOCK uses sturdy leather with a thickness of 2.8 to 3.2 millimeters as upper material. FOOTBED MATERIAL: CORK Cork is a sustainable material extracted from the bark layer of the cork oak. This natural product is insulating and offers very good cushioning. OUTSOLE: EVA EVA (ethylene vinyl acetate) is a high-quality, very light, elastic material with extremely good cushioning. As a result, it smooths out slight irregularities in the floor and ensures that every step is softly cushioned.