From Birkenstock, the Women's Sydney Patent Luxe Buckle Hardware Slide Sandals feature: Birko-Flor® Patent is made from our easy-to-care-for, moisture-repellent synthetic material Birko-Flor® with a patent finish Double-banded design with adjustable buckles Classic contoured cork footbed supports the arches of the foot Deep heel cup for all-day comfort EVA outsole Flat heel Imported. Sizing Notes: Birkenstock footwear is made in European whole sizes. The style selected is a Birkenstock narrow footbed that will fit most medium feet.