Birkenstock Arizona "Soft Footbed" Birko-Flor Sandals, Basalt, Unisex, 39 M EU (US Women Size 8-8.5) Upper material: Birko-Flor - Made of acrylic and polyamide felt fibers, this all synthetic material is a soft fabric with a smooth leather-like finish. Birkenstock Arizona Birko-Flor Soft Footbed Sandals, Basalt (a Dark Greyish/Blueberry Blue like color), Unisex, 39 M EU (US Women Size 8-8.5 or US Men Size 6-6.5) Soft Footbed features an extra layer of cushioning foam built into legendary Birkenstock footbed. Birkenstock Arizona Black Birko-Flor Upper; Unisex Sandal. Arizona from Birkenstock is a classic two-strap style with fully adjustable straps and shock-absorbing EVA sole. Anatomically correct cork footbed that is both renewable and sustainable. Made in Germany by Birkenstock.