Of course, you don't necessarily have to give up your air mattress, particularly if you like the comfort of it. You can always add a layer of insulation to its top by using a closed-cell foam, non-inflating pad. A good one is Cascade Designs' Strata Rest 25 ($55). Mountain Hardwear's Trailhead 77 ($100) is a BIG closed-cell foam pad, big enough to cover an air mattress, while providing what I should think would be more than adequate insulation.
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