For a foot length of 26.5 cm, I chose size 43. They fit like a glove. I’ve been wearing these boots for 2 weeks already and I’m very satisfied. My foot feels максимально comfortable, and the comfort level is excellent. One downside is that the laces press on the top of the foot. But it’s easy to solve — I just don’t tighten the laces. I had the same issue with similar boots that I bought 10 years ago; maybe it’s my problem because of a high instep, or maybe the thickness of the tongue presses on the blood vessels, I don’t know. But this is something to keep in mind. And one small detail — the speed hook for the laces (the very top one) has a different shape than in the green color.