Comfort: -1°C Limit: -7°C Extreme: -25°C Temperature tested to new European standard EN13537: 2016 The renewed Neutrino 400 is a light-weight, minimalist down-filled sleeping bag, designed for light-weight end uses, now with an even better warmth-to-weight. High quality 800FP ethically sourced European Goose Down is secured by light-weight Pertex® Quantum fabrics, to ensure maximum loft for the down, without increasing the weight of the bag. The Neutrino 400 is styled in amummy tapershape, to dramatically reduce pack size, and features YKK zips throughout. Other key features include am internal collar and hood drawcord, anti-snag zipper webbing tape and a unique trapezoidal baffle chamber design, to eliminate cold spots. The Neutrino 400 is hand-filled in Derbyshire, UK. Mummy taper shape Proportionally designed differential cut Internal YKK 3 coil zipped stash pocket ¾ length YKK 5 coil main zip Left and right hand zips available - can be zipped to other Neutrinos Anti-snag zipper