Just curious if anyone has been using a Neoair Xtherm? I have been using my Exped DAM 9 (regular 20x72) and find it very comfortable and do not get cold shoulders, but would like to drop a chunk of weight. The Xtherm regular is only 15 oz, compared to the 34 for the DAM 9. For reference, I will be using in the WBRR dl. DAM UL 7 has essentially the same R-value (5.9 vs 5.7) as the Xtherm but is 20oz for the regular size.