BIRKENSTOCK. 433063 433061. IONA BLACK LEATHER STRAP.A classic Mary Jane style with all the comfort and support of the Birkenstock footbed. Features an adjustable hook an loop instep strap for a precise fit. Made in Portugal. Leather - smooth high quality leather. Removable contoured cork footbed conforms to the shape of your foot and features pronounced arch support a deep heel cup and roomy toe box lined with suede. Durable rubber sole for traction and support. Avoid extreme heat.