For a foot length of 26.5 cm, I chose size 43. They fitted like a glove. I’ve been wearing these boots for 2 weeks already and I’m very pleased. My foot feels maximally comfortable, and the comfort level is excellent. One drawback 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; perhaps it’s my problem because of a high instep, or perhaps the thickness of the tongue presses on the blood vessels, I don’t know. But this is something to be aware of. And one small detail — the speed hook for the laces (the very top one) has a different shape than in the green colour.