Birkenstock GIZEH women's Flip flops / Sandals (Shoes) in Brown Synthetic, Available in women's sizes. 2.5. Upper: Birko-Flor, a very soft & durable material exclusive to Birkenstock Midsole: Cork & Latex support arch Protective edge for toes Deep heel cup Vegetable tanning (without chrome) Free Next Day Delivery & Free Returns on all orders!