I've got a Mammut Status Belay Jacket...
http://www.ukclimbing.com/gear/review.php?id=849
It's now a bit knacked after years of heavy use, so looking to replace it.
It's synthetic insulation which is good for machine washing, more bulky/thicker than the things I'm seeing in the shops just now, without being as bulky as the sort of thing you might want to wear up Everest.
Anybody got any suggestions for a VERY similar jacket that I could have a look at?