To determine your correct size, you can measure your foot using a tape measure or ruler. You can also refer to Signature's size chart, which can be found on their website or in the product description of the boot you are interested in purchasing. It is also important to consider the fit of the boot, as different styles may fit differently. Some Signature long boots may run large or small, so it may be helpful to try on different sizes or consult with a Signature representative for assistance.