grey patent calf leather two strap and buckle fastenings moulded footbed suede lining cushioned insole EVA midsole rubber sole slip-on style 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.