I bought an InsulMat Max Thermo 3/4 length from Sierra Trading Post last winter. It weighs 17 oz (on my scale) and really does the job (I'm a side sleeper who gets really painful hips and shoulders on hard surfaces, and I have large hips). I have no trouble with its construction. The trick is not to blow it up all the way but only until it's about half full. Of course, when empty and folded it doesn't do much towards stiffening the pad pocket in my pack (Six Moon Designs Comet), but I also carry an insulating pad (30" x 20" piece of a Coleman closed cell foam pad, 3.5 oz.) for my dog, which takes care of that problem. At 17 oz., the Max Thermo is 11 oz. lighter than my 3/4 length Thermarest LE (no longer made), and cushions me better. I haven't yet tested it on freezing nights, though. If it turns out to be borderline, I might have to carry a second torso-length pad to help with insulation.