Passing my (standard rectangular green) Neoair Venture onto my son provides me with an opportunity for a (modest) upgrade if I fancy. I've found the neoair very comfortable, and warm enough if used with some reflective radiator foam underneath, and would be quite happy with a direct replacement. However, I wouldn't want to pass up the opportunity for something better! My main criterion for better would be lighter - I'm quite happy with the comfort of the neoair venture (though I wouldn't want it's replacement to be less comfortable), and although it has a very modest r value of 1.3 I only realistically camp in temperatures down to zero and have grown to quite like having the length of radiator foam as a sitmat. I was tempted by a neoair xlite, but I can't really justify going over £100, and, as I've said, I think the extra insulation is probably more than I need. So these two mats have caught my eye - the Sea to Summit Ultralite uninsulated, and the Klymit V Ultralite. They both seem to come in, from some sellers at least, at around £80 - £85, and both are a substantial improvement in weight compared to the neoair venture. What do folk think, particularly about comfort? And warmth - they do have even less insulation than my neoair - perhaps I'm being naive expecting to compensate for that with a bit of radiator foam. And does anyone have any other suggestions?