The classic among Birkenstock slippers! It has been in our rang for years and will stay for many more! Madrid Silver is a very neutral slipper that goes together with all your sporty outfits. Elegant and comfortable. Madrid Silver is made of Birko-Flor, a very soft material that reduces the risk of irritation and blisters. The orthopaedic foot bed makes this slipper unique and reduces the risk of foot, knee or back pain. Birkenstock uses German shoe sizes. That is why one size smaller than your usual size is recommended.