Based on the title you may expect something different here. But Really, I hate mummy bags! I gave this one a shot out of necessity for light weight and size for backpacking with my two boys. I was not sure if the elastic stretch would really do as promised and stated in other reviews that I looked at but it did! I tested the bag before my last trip and was happy with the ability to move in the bag and also I found that I could fit all the way in the bag and sleep on my side or stomach with my head covered but without pulling the bag closed. I really don't like cinching down the bag over my face! The shoulder room is good and the warmth of the bag i found to be on the mark. The last trip temp at night was in the hi 30's and with a slight breeze, just enough that a few of the tents had small amounts of ice on them in the AM. With one base layer on and a beanie ( because I didn't cinch down the bag over my face and head ) I was actually hot, my legs seem to sweat a bit. I was so happy with the bag that I purchased a second one for my oldest to replace his 30 Deg. synthetic bag. I have used other big name mummy bags and not been nearly as comfortable in them so I am very happy with this purchase!