I used this overnight, down to about 22 degrees F, wearing just running shorts and an R1 hoody and I was plenty warm I suspect with actual clothing you could get down to 10 without issue. The straps were great and easy to use with my sleeping pad. I managed to put them on in the middle of the night after rolling around and uncovering myself and realizing what they were for. I have used this only for one trip so far, so I cannot comment on long-term durability yet, but it looks and feels well-made. Customer service was great! This was a last minute trip and they were able to get the bag out to me in just a few days. No other manufacturer that I was considering would have been able to get me product anywhere near as quickly. These ready-made bags are a great option. I'm 6'3" with 45" chest and opted for the long / wide size because I sometimes sleep on my side.