This is another new addition to the Thermarest line that just came out mid last year. It is only filled with air, but has heat reflective technology to give it an R value of 4.9 and at only 19 ounces! That's enough R value for year around use for most people and it is very comfortable:
Neo Air All Season:
Therm-a-Rest NeoAir All Season Sleeping Pad - Free Shipping at REI.com
I'll be picking this up for hunting this year, but will get it soon here as we need it for a family backpacking trip down into the Grand Canyon in April.
Right before it came out I purchased its immediate predacessor which weighs and feels exactly the same but has a much lower R value of 2.0--OK for summer/early fall stuff although I used it alone this year on a November and December elk hunts with temps down into the low teens:
Neo Air Trekker:
Therm-a-Rest NeoAir Trekker Sleeping Pad - Free Shipping at REI.com
With temps that low, though, I was using a -30F rated Feathered Friends bag of mine and would've been toasty warm almost no matter what.
I used this pad quite a bit throughout the summer and fall on ocean kayaking trips and backpack hunting and I can't tell you how comfortable it is to me. I actually think it's at least as comfortable as our mattress at home. The first time I blew it up, I was inadvertently and comfortably asleep in 5 minutes, with no intent to do so.
The predecessor to the Neo Air Trekker is the NeoAir:
THERM-A-REST NeoAir Sleeping Pad, Regular - Eastern Mountain Sports
It's lighter at 14 oz. and comfortable, BUT the material is very thin and VERY crinkly which results in it being very loud to sleep on if there is any movement. And, there have been many reports of punctures due in part to the very thin material. If you take care of it carefully and don't mind how loud it is, 14 oz. is pretty light for a comfortable nights sleep.
In the beginning God created the heavens and the earth. Genesis 1:1
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