Great at night and even in the morning iwhen the sun begins to heat up the tent.
I had no problems and this sleeping bag is perfect for a big guy like me. I'm 6'2" and weight 240lbs and it was roomy.
It also works great with the Big Agnes sleep pads, which you should buy as well to complete the system.
This review was written in the old system and had content requirements that are different than reviews written today.