I'm preparing to make my first UQ. I'm thinking of using two layers of 6.0 Climashield (1-2" loft/layer) sandwiched along with three layers of IX (one on top, one in the middle and one on the bottom). Will this UQ to be capable of combating 20-0* weather? Hopefully this combination will give the IX airspace to maximize its efficiency. Its weight will be around 3.6 lbs once its all sewn together with the top and bottom ripstock nylon lining and accessories, which is a bit of a concern to me presently. Anothrer option would be to use 1 layer of Climashield and 2 layers of IX insullation which would reduce the weight to a bit over 2 lbs, but I don't know if it would be enough to keep you warm. Any ideas on this combination?