Ultralight 0F/-18C You won't believe how much warmth and comfort you get from such a small package - the Nitro packs into a tiny sack (included), but stays toasty to 0 degrees. Sierra Designs build in Flex between the shoulders and knees, so you get the comfort and thermal benefits, while saving precious ounces. Continuous baffling and a draft tube contain 800-fill goose down, the warmest, lightest insulation available. Ergonomically shaped footbox. Removable pad locks. Snag-free zipper tracks. Draw cord at collar. Draft collar. Ultralight footbox vent (12''). Offset ultralight jacket zipper (30''). Ultralight Jacket Hood. Partial Flex on the exterior torso. Zipper draft tube. EN Tested. Includes stuff and storage sacks. Shape: Mummy. Fits to: 6 ft / 183 cm. Length: 76 in / 193 cm. Zipper Side: Left. Fill weight: 31 oz / .9 kg. Total weight: 2 lb 15 oz / 1.3 kg. Stuffed diameter: 9 in / 23 cm. Stuffed length: 17 in / 43 cm.