Papillio by Birkenstock Slingback Strap Sandals: Caterina Black - The Papillio Caterina is a soft and cozy sandal with stretch fabric uppers that will fit most feet. The secure heel strap makes it a great style for travel or running around town. Contoured cork footbed has great arch support for all day comfort. Soft, moisture absorbent suede liner. Deep heel cup keeps your heel supported for good body alignment. Shoes are in excellent used condition, only worn a handful of times. Shoes haven't been molded to any foot yet. Shoes are a size 39 which is equivalent to a women's 8.5/9