Unisex Crocs Siren Clog in Black/Black, model crocs echo, is a slip-on casual shoe made of rubber upper and outsole materials. It features a solid pattern, round toe shape, and fleece lining material. The shoe is suitable for travel, activewear, and casual occasions during summer, fall, and spring seasons. The shoe is available in women's size 9 and is unisex. The shoe is branded with the Crocs logo and has accents. It is not vintage or customized.