Originally Posted by Cannibal
If you aren't using a pad under you for insulation, there isn't much reason to go with the double layer IMO. My guess is that even during the summer, the temps are cool at night where you are; correct? If that's the case, you're going to have your underquilt below you anyway which will block the bugs from biting through. Plus, unless you sleep naked (don't ask, don't tell) your clothing will act as a second layer to prevent them from biting through the hammock.
The single 1.7 is every bit as flat as the double 1.1 for me.
+1 on this... unless you plan to hang in a mosquito infested area with hot night time temperatures.
A single 1.7 works well for me at 190#, and I use an UQ, even in the summer.