The Mayari sandal has a contoured cork foot-bed which conforms to the shape of the foot. The two straps, each with an individually adjustable metal pin buckle, ensure a secure fit. The microfiber in-sole unit has a pronounced arch support & deep heel cup, plus a roomy toe box. The upper is made from flor nubuck, an easy-to-care-for and hygienic PVC, which looks like nubuck leather. This high-quality material is very gentle on the skin and comfortable. Birkenstock sandals fit true to size.