When you order Parlanti or in fact any tall riding boots from Just Riding a member of staff will contact you to make sure you have selected the correct size. We do this with every order. It is actually very simple to measure yourself for Parlanti Passion Riding Boots.Take a standard household tape measure I would highly recommend using centimeters and not inches and it is best to ask a friend to do it for you, but not essential.CalfWrap the tape around the widest part of your calfEntranceNow wrap it around your leg just below the kneeHeightTake the tape and run it up the back of your leg from the floor to crease in the back of your kneeNow make a note of your foot size (European) and you have what you need.With this you can click on this link PARLANTI SIZE CHART and compare for yourself or you can contact us on live chat and we will help you to select the correct size. You can also browse to any Parlanti product listing on our website and click on the "Size Configurator" and enter your measurements. It will automatically display your size.You can also click on the following link for an image showing HOW TO MEASURE MYSELF FOR PARLANTI