US women's 11 - lightly worn, light scuffs. I wore 4 or 5 times before admitting these are a true 11 U.S. women's size, not 11.5. From Zappos site: These Chelsea boots are designed with a touch of timeless charm and cutting-edge comfort in mind. Engineered for modern women, their elastic panel design lets you step into the day quickly, fuss-free. These ankle-high boots are made of a nylon lining and a premium ECCO leather upper. Their nylon lining and inlay sole offer softness and comfort. The ECCO FLUIDFORM technology provides soft, flexible, and fluid movement within a naturally supportive anatomical fit. These heeled boots are perfect for dress-down Fridays or weekend coffee runs. Round toe design. Block heels. Polyurethane outsole.