In reply to bradzy_c:
I borrowed a mates Patagonia Winter Sun hoody last year for the winter as he was in Afghan and all he did was rave about it. Used it for a couple of gully routes on the Ben, used it in Lofoten on some ice and used It for skiing in Banff and the temp was easily minus 30.
I found it to be one of the best bits of kit I've used and have since bought one. I found all I had to do was regulate what I was wearing underneath. When I walked into the Ben, it was too hot so it was in the sack and came out as soon as we got to the CIC.
When I was climbing and skiing, all I had on was a Helly Hansen base layer and a long sleeved t shirt. When I felt the cold a bit, I put a Patagonia pullover on and I was toasty.
Can't recommend it enough. Hope this helps, Den
http://www.ukclimbing.com/gear/news.php?id=4068