I am just a smidgen short of 6 feet tall and went with a long bag and I would not do that again. I have a WM Megalite Long and it is a wonderful bag but the extra length is dead air space that has to be warmed up. Recently I borrowed a WM Ultralite regular length for a trip into the Sierra's and it was significantly warmer for me. I am a COLD side sleeper and the length was just fine. I am going to make a down quilt, actually, my wife is going to make it and try that out with all 4 inches of loft on top!