Just got my Hennesy Expedition Asym and after a couple of test nights in the house, the verdict is that I love it! I am now looking at a Mac Cat tarp for a larger footprint, and will do an outside test run very soon.
My question is regarding the underpad or bottom insulation. Has anyone ever used something such as a Pacific Outdoor Equipment Uber-Lite Sleeping Pad? Will something that does not cover your foot area be warm enough? I have a Thermarest Prolite 4, and also a few of the old Army foam mats, but I have no experience to know which way to go.