The Birkenstock Madrid model is a true classic that excites the world of fashion with its essential design. The Big Buckle variant has a large and elegant ardiglione buckle, a nice detail that stands out on these very sober sandals. The subsidy of the semi-Exquisit footbed is covered in soft smooth skin in coordinated color to the shoe. The upper consists of particularly thick and oiled Nabuk leather, worked in open seams. Anatomical footprint in cork and latex; Semi-Exquisit Upper: oiled nobuk leather Flags: smooth skin Sole: Eva Details: a belt with a individually adjustable metal ardiglione buckle; Plantar in coordinated color "Made in Germany" Superior material: oiled leather Oiled skin is one of our favorites. Its oily and waxed surface creates unique color effects and a beautiful patina. The oiled finish of our natural leather products leads to a consequent variation of the color and makes each pair unique. Internal sole: Nappa Nappa is a fine and particularly enveloping smooth skin. Nappa lends itself very well to be modeled. This is why it is excellent for covering the plantar. Drypal material: cork The cork is a raw material that regresses, obtained from the surface layer of the cork oak. This natural product isolates from the heat and has excellent shock absorbing properties. Sole: Eva Eva (Ethylene Vinil Acetato) is a precious plastic, particularly light and elastic, equipped with extraordinary cushioning properties. It is able to compensate mild irregularities of the ground and gently cushions the steps during the walk.