Used multiple times camping this past winter in SE AK. Warm enough to sleep in a light base layer and beanie. Booties and gloves if really cold. Nice fit w/room to store clothes, bottle, electronics down the sides, between legs or bottom of bag. Very impressive loft. Save the compression sack that comes w/bag - it works.
This review was written in the old system and had content requirements that are different than reviews written today.