I use the Mobile Mummy 1.5 for sleeping in a hammock, it is very easy to get into and out of, or move around. The arm holes are just what is needed. It packs VERY small! At 2 lb. it pairs well with other down clothes for sleeping in winter. I recommend it for cold weather use, but only in conjunction with well thought out clothing, depending on temperatures. Excellent quality, well designed. A permanent piece of backpacking gear for me from now on.
This review was written in the old system and had content requirements that are different than reviews written today.