How to choose your size Our sizing buttons list the Womens size first (W) and the equivalent Big Kidssize second (K) Ex. If you usually wear a Big Kidssize 5, select the button with W 7.0 / K 5.0. Sizing Information: EURO SIZING: Please see conversion for the best size to choose: Womens US 4/Big Kids US 2 = Euro 35. Womens US 5/Big Kids US 3 = Euro 36. Womens US 6/Big Kids US 4 = Euro 37. Womens US 7/Big Kids US 5 = Euro 38. Womens US 8/Big Kids US 6 = Euro 39. Womens US 9/Big Kids US 7 = Euro 40. Womens US 10 = Euro 41. Product Features: Durable synthetic upper material with a nubuck leather-like texture and soft backing. Suede footbed lining. Cork-latex footbed is anatomically shaped. EVA foam sole. Adjustable metal pin buckles at each strap. The Birkenstock Arizona Birkibuc is imported. The classic Birkenstock silhouette is back and better than ever on the Womens Birkenstock Arizona Birkibuc Casual Sandals. Featuring a two strap design with buckles and a smooth, Birkibuc upper material, these sandals offer comfort that lasts. Womens Birkenstock Arizona Birkibuc Sandals