100% authentic! EU size 40. There is no better way to go from running errands to casual nights out year round than these very sophisticated YSL leather slides. They feature top notch leather and a subtle but bold tone on tone humongous YSL insignia over each vamp! They even come with a gorgeous black YSL shoe box too! You’ll fall in love with the comfortable and style and the color goes with everything. Smart investment on high end footwear!