Perfect for cold mountain conditions, the Neutrino 800 is hand filled and contains the highest quality 800 fill power ethically sourced European Goose Down. It is made using the lightweight, yet durable Pertex® Quantum (Pertex® Quantum uses a tightly woven structure to provide a light and soft fabric that allows insulation to fully loft. With down proof construction, a DWR finish and soft feel, it's a lightweight and packable windproof fabric offering excellent weather protection) which allows the bag to have an impressively small pack size but quickly loft for instant warmth.

The ‘mummy taper’ shape and angled footbox keeps overall weight low without compromising on warmth or comfort, while still allowing movement. The ergonomically designed, close-fitting internal collar with a hood drawcord, as well as a 3/4 length YKK anti-snag zip with an insulating draft tube keeps out the cold. Also featuring a handy internal stash pocket, dry bag compression stuff sack for transport and cotton sack for storage.