As the oldest member of the family, the Madrid from BIRKENSTOCK is a classic. Introduced to the market some 50 years ago, this sleek, single-strap ``gym sandal`` has since established itself as a true fashion ally. The current variation has a metallic sheen. The upper is made of the soft and durable synthetic material Birko-Flor®.Anatomical footbed made of cork and latexUpper: Birko-Flor®Overlay: suede leatherOutsole: EVADetails: Adjustable strap with metal buckle ``Made in Germany ``Upper: Birko-FlorBirko-Flor is made of a hygienic and easy-care PVC plastic, the inside is bonded with a soft, heat-active fleece layer. The high-quality material is hypoallergenic, pleasant to the touch and very durable.Insole: InsoleThe hypoallergenic, flexible leather insole gently moulds to the foot and adapts to its contours. The open-pore surface is particularly thermoactive and keeps the feet at a comfortable temperature even during intense physical activity.Footbed Material: CorkCork is a renewable raw material that is extracted from the bark of the cork oak tree. This natural product is a thermal insulator with very good cushioning properties.Outsole: EVAEVA (ethylene vinyl acetate) is a high-quality plastic that is particularly light and elastic and has very good cushioning properties. Small irregularities in the ground are therefore compensated for and each step is cushioned gently when walking.