La Sportiva Nepal EVO
These boots are very comfortable in any conditions, probably the best leather mountaineering boots out there. The only concern should be to get proper fit if you are buying them online. My foot size is 29.5cm and I wear size 46.5 or (12.5+) Nepal Evo which allows me to have enough space to wear thick mountaineering socks unlike size 46 which was little tight after wearing over the thick mountaineering socks. There was no issue in returning size 46 for 46.5 with backcountry.
PS: For more information about sizing I wear Merrell Legacy size 12US. Hope this helps.