Just a quick thought, I took my LPP out today to give it a test run in this weather we're having. Central Oklahoma, wind chills around -20 I believe. Took a quick stroll (15 minutes) and had full exposure to the wind. This thing rocks. As long as my exertion level would stay up to walking or above level, I believe I'd stay warm for a very long time, cuts wind very well. Had I been sitting I would have needed a secondary mid weight layer.