The Arizona is Birkenstock's classic two-strap style that has been around for ages. The Birkoflor option is a synthetic, leather-looking upper that is easy to clean and less expensive than the leather options. Adjustable straps and a phenomenal cork footbed loaded with arch support has made this one a favorite. Available in Black Birkoflor.
Brown Birko-Flor 
Habana 
Habana Oiled Leather