Great, with limitations
This is a nice bag but in my opinion is best suited to car-based or warmer weather camping. The problem is that with no insulation underneath you, if the (inflatable) mattress punctures on a climbing trip at high altitude you are in big trouble. Also, when the mat is inflated the bag is extremely slippery and i slid down the bag the whole night. I put down some duct tape which helped. Also the bag was quickly punctured and was leaking feathers, the hole was my fault I guess but I wish bag makers would make the outer liner a little tougher. Phenomenal bag for car camping though and it is very warm.