So I own an Exped Synmat UL7 20"x72" which weights (with little sack) 475 grams / 16.8 oz plus the .4 oz repair kit = hair under 17 oz for conversation sake.
I am tempted to buy a blue foam pad and test it out, not really as a weight savings so much as a hassle savings. Besides setting up my shelter, blowing up, then deflating and rolling up my sleeping pad is the biggest hassle of my camp setup. It also gives me grief worrying about putting a hole in it with my little 18lb dog that comes with me, sharp objects, etc. How nice would it be to be able to just yank the pad out, throw it in the tent, throw my quilt on top of it and be done with it?
Another thought is I use a GoLite Pinnacle and I figure I could eliminate the foam back pad and holder for it if I had a foam pad that I could put in a circle to line the pack.
Of course the downside is it's not going to be as comfortable. Also the R-value of the Exped is 3.1, blue foam mat R-value is 1.4 I believe.
Curious what other people think. Seems like most people go the other way, from closed cell foam to air mattresses. I have never slept on a closed cell foam mat, bought the Exped as my first mat.