The Birkenstock Madrid Big Buckle Birko-Flor Narrow Fit Blue has a single waistband with a distinctive buckle that allows for precise adjustment. This model is designed for women with narrower feet and the anatomical cork-latex insole provides stable foot support. The upper is made of Birko-Flor® material with a glossy patent surface, which is pleasant to the skin and easy to clean. The EVA outsole contributes to low weight and basic cushioning, making the sandals comfortable for casual wear as well as leisure activities.