Womens Birkenstock Arizona Slim Fit Double Strap Sandals feature a fully adjustable two-pin buckle, designed to aid and support the perfect fit. The classic Birkenstock is best bought with a little extra room, so the ability to adjust straps is very important. It allows the feet to breathe and move in the most natural way possible, so these sandals are some of the most comfortable on the market. These Birkenstocks are slimmer in width than the classic variety, making them ideal for fashion fans with narrow or dainty feet. Upper: Synthetic. Lining: Suede. Sole: Rubber. Heel Height: 1 Inch