I took this sleeping bag out for camping where the temperature dropped to 26F. Even with 4 layers I was still cold in this bag. I had to resort to using a sleeping liner to keep myself warm through the night. I really love how soft and comfortable this bag feels. Slate Grey / Atomic Blue color combo looks fantastic. But because this bag is not warm enough and the fact you pay such a high premium for it I ended up returning Marmot Plasma 15. In the end I purchased Marmot Helium (15F) for $100+ cheaper, it packs down 1in smaller into its stuff sack than Plasma, and overall feels warmer.
This review was written in the old system and had content requirements that are different than reviews written today.