In reply to Luuuke: I can't say I've had much opportunity to use it in winter mountain conditions yet, but I do like my Rab Photon Belay Jacket:
-Pertex® Endurance water resistant rip stop outer shell, 30D on body, 50D in abrasion areas
-Warm 200g Primaloft® Sport in body and 170g Primaloft® Sport in sleeves
-Light 100g Primaloft® Sport in hood
-1-way YKK water resistant zip with internal insulated zip baffle and chin guard
-Fixed hood with wired peak
-2 YKK zipped fleece lined hand warmer pockets and 2 YKK zipped chest pockets
-1 internal elasticated mesh pocket
-Adjustable velcro cuffs
-Double exit hem drawcord
-Supplied with stuff sac
-Weight 710g
I'm not sure why, but unfortunately it is not in this winter's range so if you're interested you'll have to hope someone happens to have one left in your size. Worth a look though!