I’ve had this bag for about 6 months and have used it a number of times in the Colorado spring and early summer and have been pleasantly surprised at just how warm it kept me. I’m 5’7 and 115 pounds so staying warm is very hard for me. I recently brought it on a 5 day backpacking trip in the Tetons and was actually so warm at 11,000ft I got a little sweaty. Not the smallest for backpacking but since it’s down it stuffed into a smaller stuff sack fairly easily. Great bag for the price, size, weight, and material!
I did A LOT of research when it came to purchasing a sleeping bag! My worst fear when backpacking is being cold and not being able to sleep! I was not disappointed with this bag. It kept me so warm; I even had to unzip and stick an arm out. It compacts down perfectly and fits in my bag and I even have enough room for my sleeping pad (inflatable) and pillow. This is a great bag and I would definitely recommend it!
Nighttime temps ranged from 40-60 deg F on my 6-day night trek in the eastern Sierra Nevada. The trick to not sweating in the bag in warmer weather is to wear a thin layer of silk long johns and top. No bare skin inside the bag. Center the top and bottom zippers mid-bag, so your legs and upper torso areas vent. Fits nicely into a 15 liter compression bag.