Built with Birkenstock's famed long-lasting, super-walkable cork sole, the Arizona is equal parts mystical, magical, and down-to-earth practical. Head for the beaten path. By: Birkenstock. Birko-Flor® Patent upper material Natural leather insole Sturdy leather with a thickness of 2.8 to 2.3 millimeters Cork footbed Sustainable cork footbed extracted from the bark layer of the cork oak EVA outsoul Size 37 ***These have only been worn two or three times I bought them and then realized the style is just not for me. I selected "like new" because they are an excellent condition. My loss !