Excuse me if this has been discussed before but a search only brought up discussion about the clothes. I was wondering about the use of columbia's omni-heat material being used on the top side of an underquilt. Is it possible to buy the material? I have never worn any of the clothing that has it, but have heard it's quite warm and breathable. Would it add too much weight to even justify using it? I would think using it on a lighter 3-season quilt would help it go down to some lower temps. I know when I used a space blanket with my supershelter it made a huge difference. Any thoughts and comments are appreciated! I'm kinda new at all of this, it just sounded like a good idea to me.