For exact size please refer to the table below the photo. You measure thickness of the calf (Calf), and the height of the lower leg (Height) in cm, these can be found in the last two columns. It is most practical to the chaps at Peerdewinkeltje get fit because it is sometimes difficult to assess. Maybe there among the many other models have a more comfortable fit for your leg! The Ariat hal-chaps match perfectly with the Ariat Paddock.