I have the 25L uninsulated air version with the foam topper and it is so comfortable and I have never had such a good nights sleep in the woods. Like I said earlier the integrated pump kind of sucks, but it's only a minor inconvenience.Been toying with the idea of getting the cosmo in a 30xl. Really like the idea of a 30" wide pad. I have all sorts of neck and back issues that flare up when sleeping on a pad. Seems like a thick wide pad would be worth the weight penalty.