In reply to Matt250: Used the outdoor designs and the dachstein ones, both have their place but I reach for the OD ones first for belaying, i.e. if your not climbing in them too. I don't find the dachs as warm when stationary and you can put normal mitts down your top so they're warm for the next belay. I never know where to put the dachs if I'm not climbing in them, down your top and you get soaked and cold and then they're wet and useless at the next belay, anywhere else and it's like putting your hands into the freezer when you try to put them on again.
They're also a bugger to dry out, if you forget to put them on for the walk out you'll be scraping ice off them in the car park.
The other option is a pair of dachs and a w/proof over mitt, probably best of both worlds but more expensive than the OD summits.
Ben