I used this bag down in Moab, Utah. Comfortable, zippers are smooth and don't bind up too much. The only issue I had is I used the Big Agnes Air Core pad with it, when that pad is fully inflated it does stretch out the bag and does make it difficult to zip it open and closed. I had to let some of the air out of the pad to allow to zipper to open and close smoothly. But had no issues with being comfortable and warm with the sleeping bag.