When I climb mountains such as Mt Washington etc I wear several layers.
One of which is amazingly warm.http://www.backcount...Parka-Mens.html
One thing to point out. Only in the past year or so have I started climbing/backpacking for sport etc. You will never find a "One jacket does it all" type of deal. Layering is the Key to survival and being warm + cool. The most dangerous thing you can do when climbing or doing anything out in freezing cold temps is to sweat. Sweating can quickly lead to hypothermia and then death.
Generally I wear a wool or synthetic base layer. Ontop of that I have a synthetic long sleeve. On that I wear a fleece. On that I wear a tight fitting jacket. On top of that goes my outer shell which is mainly windproof/waterproof. If i am still cold I wear the jacket I linked above over all that.
I have probably invest almost 1500 bucks in my upper body layers alone. Same type of deal for my lower body.
Edited by Sophism, 10 February 2009 - 02:59.