According to Amazon Size Chart 10.5 D US is corresponding to 27.31 cm, and my foot is 27 cm so I ordered 10.5.
But when I received the boot (10.5 indeed) and measured the inner size I found it is about 30 cm, insole size is 28,5 cm.
It is too large for me, I cannot send it back from Ukraine and have to try to resolve this with a local shoemaker and pay for this.
Please contact me directly in order we could resolve this.