I'm a U.S. 4/6 and i bought a 44. The extra 20% was for black friday or cyber Monday, i don't remember which. And I think they had 15% off for the rest of the week. I don't know if they still do. I was considering a shearling they have but I'd want to size up and they didn't have a 46. I haven't received a shipping notice though which upsets me. I've emailed them about it.
Thank you, I hope it arrives soon.