I have a pair of size 44 Scarpa New Manta boots – worn once or twice only as they turned out to be too small, and a pair of Altberg Tetherer medium width boots UK size 10, again, probably only worn once or twice as they also turned out too small once in use on the hills. The Scarpas are stiff enough to take crampons. The Altbergs are really only walking boots.