Very warm.
My husband used this sleeping bag camping in the mountains of central Idaho last summer. I gave it to him for Christmas last year. The bag kept him toasty. It is very roomy and long enough to fit a 6'2 man. I also used it once for me and my 10 year child to share while camping. I am 5'5. It fit both of us. We stayed very warm. This bag is huge, though, and takes a lot of room in our car trunk. Don't even waste your time trying to roll and bag it back in its original storage bag.