Cushioned sole and nice leather strapsBirkenstock Arizona is the brand’s most well-known and talked-about model. It has two leather straps and these are easy to adjust if you want to make them either larger or smaller to fit your foot. The Arizona model is made of natural leather and has a sole that is made of natural cork which is one of Birkenstock’s special characteristics. There is also a middle layer to provide extra cushioning and make the shoes even more comfortable to wear. Birkenstock Arizona Regular has a normal last.