Sun TanGenuine Spanish leather uppers with rubber soles, hand sewn with a quality linen thread. Comfy beyond measure, you might as well be barefoot! Due to the natural nature of leather, there may be a slight variation in the colour. TIP! If you are pondering between two sizes, we advise going with the smaller one as the soft leather does stretch a bit as it shapes to your feet. So if you are sometimes a 38 and sometimes a 39, go with the 38. But if you are