Birkenstock Sandals Size: 37 (US 6-6.5) Style: Mayari Color: Black Crisscrossing adjustable straps and toe loop. Made from Birko-Flor, a synthetic, skin friendly, tear-resistant, and easy to care for material used exclusively by Birkenstock. Overall good pre-owned condition, but as with all beloved Birkenstock, the suede/cork footbed has molded to previous owner's foot. Wear shows on the bottom soles and there are few paint marks that fell on the left pinkie toe area (see photos).