Arizona Big Buckle sandals from BIRKENSTOCK featuring olive green, faux leather, gold-tone hardware, double-strap design, buckle fastening, adjustable fit, round open toe, branded footbed, moulded footbed and flat sole. Please note that the sizing for this unisex item differs from our regular Size & Fit information. Find your Birkenstock size by adding 31 to US women's sizes and 33 to US men’s sizes. Width: sizes 36-40 are Birkenstock Narrow, sizes 41-44 are Birkenstock Regular. Please reference Birkenstock's size guide for detailed sizing information..