This item was purchased from the Vivian Collection. It has good stretch, but when I tried it on, the opening felt a little tight, so I'm selling it. I use a different product, but Vivian products are recommended because they are easy on the feet and very comfortable to walk in!! *Please refrain from purchasing if you are sensitive to used items, as I have tried them on once. They have never been worn outside. Please note that the box is not included m(_ _)m M size (23.0-23.5cm) ・Length: 25.5cm ・Width: 22.2cm ・Foot width: 7.9cm ・Heel height: 7.3cm ・Shaft height: 14.0cm ・Opening circumference: 21.0cm ・Ankle circumference: 21.0cm Based on the website information.