Kelty Cosmic

The 40°F rating indicates the lower limit of comfort for an average sleeper. It is designed for three-season use, meaning it performs best in spring, summer, and early autumn, but you should consider bringing a sleeping bag liner or wearing extra layers if you anticipate temperatures dipping near or below that mark.

The semi-rectangular shape offers a middle ground between the efficiency of a mummy bag and the comfort of a rectangular one. It provides more room in the shoulders and hips, allowing for more natural movement while you sleep, without sacrificing too much of the thermal efficiency found in tighter, mummy-style bags.

The Cosmic 40 uses high-loft down insulation, which is excellent for warmth-to-weight efficiency. While down naturally loses loft when wet, the bag features a PFAS-free water-repellent finish on the shell to help protect the insulation from light moisture and condensation.

Yes, the bag is designed to fit users up to 78 inches, or 6 feet 6 inches, in height. The expanded footbox also provides extra room for your feet, which helps prevent your toes from compressing the insulation at the bottom of the bag.

The anti-snag zipper is engineered with a specific guard to prevent the fabric from catching in the slider. While no zipper is entirely immune to snags if pulled too quickly, this system is significantly smoother and more reliable than standard zippers, making midnight exits much less frustrating.