Nice Bag, Slept great - might want to read review further
I love the size.
I am 5'5, I have sleep apnia, so I am a tummy sleeper when backpacking. With the zipper in the middle, it allowed me good access. I was also able to put my hands up above my head when I sleep on my tummy, without them being cramped or outside the bag. I didn't notice myself waking up in the middle of the night except for one time. I used it while in Yellowstone. I slept in Capeline 3 midweight bottoms, and a midweight smartwool top, and columbia sock liners. The temp got to about 28 and I was snug as a bug. not sure I would trust the bag to 15*F though. I used the bag in conjunction with a Neoair, so there was plenty of insulation while sleeping on the snowy ground. We were also inside a tarptent cloudburst, so there was littler wind.