Birkenstock Arizona Big Buckle Sandals in Cognac are unisex sandals with a narrow shoe width and a flat heel style. They feature a buckle closure and are made of leather with a cork insole material. The sandals are slip-on and have a comfortable design. The product line is Birkenstock Arizona and the UK shoe size is 5.5, US shoe size is W8/M6, and EU shoe size is 39.