Fiddleback, the night prior was spent in a tent and I don't recall it being any warmer than the the snow trench. That particular shelter probably wouldn't have held much snow but a couple of ridge poles resting on the edges of the snow trench would easily improve that. The night after this photo was taken was spent in a similar shelter, but with ridgepoles, pine boughs, and snow on top. The last night was spent without a sleeping bag, just insulated pants, jacket, and a poncho liner. That was cold. It did show what you could do in an emergency. The intent was to do with a little less each day. A couple of Nalgene bottles full of hot water in your sleeping bag or wrapped up with you in the poncho liner help. I usually had my feet resting on one and another bottle where I thought I needed it.