What is the insulation rating for this...
What is the insulation rating for this jacket?
I am basically looking to keep warm in up to -10 to -15 weather with not much underneath!?
This jacket alone will not keep you super warm in those kinds of temperatures. I would get this then suggest you look into a one piece base-layer. Like the Burton Luxury Midweight One-Piece - Women'. Or if you are not into that sort of base layer, traditional top and bottom will be good as well, the one-piece will be the warmest by far though.