robgendreau
Explorer
Not all "air mattresses" are alike. It can be confusing from reading some posts, but there's a world of difference between say a Kmart "air mattress" made out of vinyl with just air tubes, and a self inflating foam/air mattress like Thermarest and others make. The latter are the warmest things out there to sleep on aside from pure foam, closed cell being an option, but bulkier and less comfortable. We'd used Thermarests climbing in snow and ice and rarely have problems with them, and they are exceptionally compact and warm.
I also use cots, but they can be cold. You still need insulation underneath you, since your sleeping bag will compress and you'll still radiate heat to ground. Of course that's a major plus when it's hot, and in those conditions cots rule. But below freezing, and depending on your bag, you'd need some insulation on that cot. Even a mylar sheet helps. I prefer the roll-a-cots since they're compact, and have no ends, so they work for talk folks better than hitting your head on a rigid bar.
I also use cots, but they can be cold. You still need insulation underneath you, since your sleeping bag will compress and you'll still radiate heat to ground. Of course that's a major plus when it's hot, and in those conditions cots rule. But below freezing, and depending on your bag, you'd need some insulation on that cot. Even a mylar sheet helps. I prefer the roll-a-cots since they're compact, and have no ends, so they work for talk folks better than hitting your head on a rigid bar.