With an R rating of 9.2 this mat will keep you warm on those cold nights. Really comfortable. Packs up reasonably compact and is very well made. Before taking it camping, fully inflate it, leave it overnight, then check to see that it holds air all night. I did this with the two singles I purchased and one of them had lost half of its air overnight. So I sent it back in exchange for another one and the new one was fine. I don't think there's a better mat out there. However, they are expensive.
This review was written in the old system and had content requirements that are different than reviews written today.