The Birkenstock Sydney proves that fashion and functionality can go hand in hand. With its two simple straps, it's a real hit with women who want both high fashion and comfort. Here, we see the sandal with a silky sheen finish. The color-coordinated outsole and the buckles round off the shoe's look of sophistication. The upper is made from the skin-friendly, hard-wearing synthetic material Birko-Flor with a silky sheen.