I am a future DIYer and was wondering about this dual layer thing myself. I'm 6'5" and 275, and according to a link posted in this forum,
http://www.dream-hammock.com/ComfortRating.html, I should double up to be safe. Now those ratings were based on Ripstop Nylon. I was looking at Dutch's site and curious how the Argon 1.6 and PolyD 1.2/1.4 compared to Ripstop Nylon. Can I use one of those in a single layer? If not, can I double up the 1.2 PolyD? I know its mere ounces in difference but I want to be safe, comfortable and cheap if I can help it.