In reply to MrToffee:
I use a pair of Hanwag B2's for winter hiking, scrambling and gully climbs in Scottish winter. These boots are similar to the Triango in Sportiva. I wouldn't want to be hanging around on winter belays for long but as a boot where I keep moving it works well. Waterproof, light and fairly stiff.
For dedicated winter climbing with switching leads, long belays and low temps I use a pair of Nepal Cubes. Great for what they're designed for.