Birkenstock Madrid Birko-Flor single-strap sandals in matte navy blue. Suede footbed. Adjustable buckle. Made in Germany. Birko-Flor is a skin-friendly easy-to-care-for synthetic material used exclusively by Birkenstock. Gently worn. In good used condition. Size EU 41 From non-smoking, cat-friendly home. Reasonable offers happily considered.