The Women's Birkenstock Madrid Birko-Flor Sandals. The original Birkenstock design this sandal is a veritable classic. Originally launched as a “gymnastics sandal" half a century ago, this simple single-strap model has gone on to become a firm fashion favourite. The upper is crafted from skin-friendly, hard-wearing Birko-Flor® ensuring your feet stay comfortable all day long, while the lightweight and flexible EVA outsole provides excellent traction and stability on a range of surfaces. The Signature Birkenstock cork footbed moulds to your foot over time, providing unbeatable comfort and support. Perfect for a day out exploring or running errands around town the Madrid is designed to step up your shoe game.