Kelty Cosmic Ultra

The 0°F rating represents the absolute lower limit for survival, while the ISO Comfort Rating of 18°F is the temperature at which an average sleeper will feel comfortable and warm. For most users, this bag is best suited for conditions in the high teens to low twenties.

While mummy bags are designed to be snug to trap heat, the Cosmic Ultra features a natural-fit footbox that provides extra room for your feet to move. This design balances thermal efficiency with enough space to prevent that claustrophobic feeling.

The 800-fill DriDown is treated to resist moisture, meaning it retains its loft and insulating properties much better than untreated down if it gets damp. While it is not waterproof, it is significantly more reliable in humid or misty conditions.

Yes, the bag accommodates users up to 78 inches, or 6'6", in height. You will have plenty of length, though the fit will be snugger than it would be for a shorter person.

The trapezoidal baffle construction prevents the insulation from shifting or bunching up inside the bag. By keeping the down evenly distributed, it eliminates cold spots and ensures consistent warmth throughout the night.

When compressed in its stuff sack, the bag measures 10 x 19 inches. It is a substantial piece of gear, so you should plan for it to take up a significant portion of your pack's main compartment.