For a foot length of 26.5 cm, I chose size 43 and it turned out to be perfect. I have been using these shoes for two weeks and I am very satisfied with them. My foot feels exceptionally comfortable in them, and the wearing comfort is truly great. As for the downsides, the laces put pressure on the foot around the instep. Fortunately, this is easy to fix — you just need to avoid tightening them too much. It was similar in a comparable model that I bought 10 years ago, so maybe it is due to my high instep, or maybe to the thickness of the tongue, which presses on the blood vessels — it is hard to say. In any case, this problem does occur. And one more small note — the upper quick lacing hook has a different shape than in the green version.