With the advice from OregonMouse who had used a POE InsulMat, an older version of the Ether Thermo,I purchased a newer model POE Elite from a shop in Vancouver. There are two models, one with synthetic insulation throughout, which is 20oz, and the model I purchased, which has insulation just under the core, which weighs 15oz. This pad is really comfortable down to freezing,but for your situation I would get the fully insulated pad. The POE Elite is a viable alternative to Big Agnes and to Thermarest pads. There's newer models now, all a bit heavier (go figure) but still lighter than most of the competition.