Dear customer, thank you for your interest. Since the manufacturer does not share clear cm information about the neck/upper circumference of the product, we cannot give you an exact measurement on this issue. Generally, our product is: - It is a women's boot model with a zipper, below the knee. The outer material is artificial leather, the inside is lined with textile. It is suitable for daily/casual use, with a short heel structure (1-4 cm). To find the perfect fit for your calf size: - We kindly ask you to review the product images and user comments if available, - Measure a similar boot you have with a tape measure and compare it. If you have any other questions, we will be happy to help.