In reply to Roberttaylor:
We've gone there every January for about 15 years and use the same kit we use for Scottish winter climbing, which is a Paramo Aspiro or Velez and Paramo Salopettes. If it's a long walk in, I'll strip off my Life base layer and put a my dry Buffalo pile belay jacket or pile fleece on next to my skin at the start of the route.
I have several Primaloft and down jackets but still find the simple flexibility of under and over layering my Buffalo belay jacket with the Paramo second to none, no matter how cold...!