I made a new uq with ripstop, glued on layer of emergency blanket and then 3oz primaloft one. I had left over primaloft so the core area is doubled up. First I am having a hard time getting it tight up to the hammock with out the shock cord digging in to my head and feet, making it very very uncomfortable. Second the forecasted low was 40 with no wind. I woke up at 4:30 with my whole back side freezing. I reached my hand down and it felt like the there was 4-5 inchs of air space. Tried to tighten everything back up but was still cold and everytime I moved at all a new blast of cold hit my back. Any help? and any Idea what a realistic temp rating would be for a warm sleeper. I hope better than what happened last night.