I don't believe Airstream Superior. They are grossly overrated and the one my friend used to ahve always reeked of smoke due to the carpeted walls. I have a Arctic Fox and I would trade it even up for a new Airstream. IMHO they are good quality only but develop a leak in one of the riveted seams and you can junk it. I read somewhere the R Value was 7 for an Airstream, 18 for a Arctic Fox.