It seems to be a size between 27.5cm and 28.0cm. I purchased these new at a Lacoste store and wore them a few times, but the size didn't fit me. The elastic rubber on the instep makes them incredibly easy to wear. There is some minor soiling from use, but the soles show little wear, so I think they can be used for a long time. It's a great deal if the size fits you. - Brand: LACOSTE - Color: Navy - Design: With straps - Sole: Rubber sole Thank you for looking.