In reply to Mark Stevenson:
> (In reply to flat eric) If you are tempted to use them in very cold conditions it is very good advice to use full over-gaitors with them which gives you a fair bit more insulation.
A few more of my thoughts on full foot gaiters are here:
http://www.ukclimbing.com/forums/t.php?t=369284 I actually wonder how much difference they make in really cold weather where moisture isn't an issue. I think they definitely help in conditions when you are walking through bog/slush/mud before you get to where you are climbing, but I would expect that is less of an issue in the Alps in winter?
Crampon choice is also a factor. Crampons with metal under the ball of your foot make your feet feel colder (not so many around these days but I used to have BD Switchblades which were hopeless in this respect!).