I hiked a little over 3000 miles this year using this sleeping bag. I spent many nights in this bag when the temp dropped to the teens. I'm not going to say I was toasty every time, but I wasn't hypothermic either. You can't beat this bags weight to warmth ratio. I could stuff it to fit into a climbing helmet, and fluff it back to life day in and day out. When it was warm out I didn't always have enough ball room... so use it as a blanket. I would highly recommend this bag. Just know its limits and your own.