Good down to Zero...
I bought this bag last year before a trip to the ADK. I got it on sale so the price was right, I would have spent a little more to get something lighter if this one was not on sale. But I am very happy with how it worked in the cold damp north east weather. I used it with an inner liner to give me that extra 5 degrees of warmth. The temp on one night went well below zero and I was very cozy. But a big part of keeping warm is your sleeping pad too. Im 6 ft. tall and 185 lb. and fit in the regular fine. The half zipper is so so, but really didn't bother me.