I did a 12-mile hike recently, temps got down to 20 degrees. I stayed warm, not toasty, but I did layer a bit with thermal's. I did love the room and being a side sleeper, the typical mummy bag is just not for me. I will take the layering a bit to stay warmer over the tight feeling I have in a mummy bag.
This review was written in the old system and had content requirements that are different than reviews written today.