When you measure your knees you have to make sure that you do it under the kneecap, to get the correct measurements. It is important that you measure directly on the skin and not on the outside og yoour clothes, to get the better results. Use maesuring tape and check the tabel below, which shown in centimeters. If you are in doubt about the size, feel free to contact our support.
Due note that the sizeguide only is guiding.