Neutrino 400 Long Ultralight Down Sleeping Bag

About the Rab Neutrino 400 Long

What is the Rab Neutrino 400 Long good for?

The Rab Neutrino 400 Sleeping Bag is ideal for fast-and-light alpine climbing, 3-season trekking, and mountaineering where every gram counts. It’s purpose-built for outdoor enthusiasts who want reliable warmth, minimal weight, and compact packability.

How will some of the key features of the Rab Neutrino 400 Long enhance my experience?

This sleeping bag features a lightweight Pertex Quantum outer shell and 400g of 800FP ethically sourced European goose down for excellent warmth-to-weight performance. The down is treated with Nikwax Hydrophobic Down, which continues to insulate even in damp conditions, dries three times faster, and retains loft up to 60 times longer than untreated down, all without the use of PFCs. Trapezoidal box-wall construction maximises loft and minimises cold spots, while the tapered mummy shape and angled foot box improve thermal efficiency and comfort. Additional warmth is sealed in with a close-fitting neck baffle and drawcord hood. A full-length baffle behind the ¾ YKK main zip prevents draughts, and an internal pocket provides easy access to small essentials.

Why choose the Rab Neutrino 400 Long?

If you’re an alpine climber, trekker or mountaineer looking for a sleeping bag that offers superb warmth with minimal bulk, the Rab Neutrino 400 is a top choice. With its hydrophobic down, ultralight construction and compact pack size, it’s a high-performance option for those who value weight savings without compromising on comfort or reliability. Hand-filled and finished in Derbyshire, UK, it reflects Rab’s decades of experience and commitment to quality.