A note on the name: the "BS" in Arizona BS designates the Birkenstock Soft Footbed version of the brand's most iconic sandal — the timeless two-strap Arizona, which has been defining effortless style since 1973, here upgraded with an extra layer of foam cushioning for go-all-day comfort. Crafted from sturdy oiled nubuck leather with a distinctive open selvage finish, this Arizona is designed to break in beautifully and age into a unique, well-traveled heritage patina that makes each pair unmistakably your own. The defining feature of the Soft Footbed construction is an additional foam layer set atop Birkenstock's legendary anatomically shaped cork-latex footbed, delivering an even plusher, cushioned underfoot feel while preserving all the orthopedic support the brand is renowned for. That.