What happens when comfort meets style? The result would be the new collaboration between Proenza Schouler and Birkenstock and the updated Arizona slides, presented here in yellow leather with contrasting black stitching and fastened with touch straps. And now you get the best of both worlds. Featuring a slip-on style, an open heel, stitching details, a touch strap fastening, an open toe, a flat sole and a branded insole. Please note that the sizing for this unisex item differs from our regular Size & Fit information. Find your Birkenstock size by adding 31 to U.S. women's sizes and 33 to U.S. 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.