I am planing top replace my sleeping bag with a top quilt and had a question. On out side of the quilt i was thinking of using Cuben Fiber and Sil Nylon on the inside or mabt Tefria. I was also going to redue my under quilt with the same, Cuben on the out side and Sil on the side agenst the Hammock. I know Sil does not breath, but if one sid does breath, does anyone see any problems with using the Cuben fiber?