The Nitrous is the perfect bag when every gram counts. It’s designed for use in summer or shoulder seasons, or can be paired with a Quest booster for year–round use. The mummy shape is generous, and filled with 800-850 loft Hydrophobic Down, it’s available in three temperature ratings (+2, -1 and -3°C ISO 23537.1 limit of comfort) and small, regular and large sizes. The lightweight downproof by construction 10 D Vapour Vent V2 fabric offers excellent breathability, durability and water repellence, while the full–length YKK #5 locking zip has an anti-snag slider and opens at both ends, allowing extra ventilation.