I really don't see a double layer of fleece getting you down to the temps you are looking for. I have a diy UQ made of one layer of fleece, one ripstop layer, and one layer of quilt batting between the fleece and ripstop. I did make V cuts to aid with the ends and used shock cord run through channels around all edges. gets me down to 40* no problem but I am a cold sleeper. best of luck!!