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Grangers Down Defend Packed with Rab’s premium 800 fill-power European goose down, the Neutrino Sleeping Bag range is treated with Granger’s Down Defend to help protect the down when camping in damp conditions. This bluesign-approved, hydrophobic treatment allows the down to resist moisture for longer, keeping it warmer, drier and lofted for longer.
What is the Neutrino -18°C / 0°F?
It's a versatile, all-mountain goose down sleeping bag, with an excellent warmth-to-weight ratio for various winter alpine pursuits and high-altitude mountaineering, when weight and reliable warmth is critical.
This updated version of Rab's popular Neutrino Sleeping Bag now features their latest Grangers hydrophobic down and a new durable ripstop fabric construction, helping it to withstand a lifetime of camping adventures.
What is it made from?
Insulation: This sleeping bag is filled with 855g of premium 800FP European goose down for maximum loft (fluffiness) and insulation.
European Goose Down is some of the highest quality down on the current market, making this sleeping bag high-grade and efficient, ensuring you get every bang for your buck.
The down is treated with a Grangers fluorocarbon-free Hydrophobic finish, which adds light water-resistance to the down itself.
Grangers Down Defend is a bluesign-approved hydrophobic treatment that helps keep down lofted in damp conditions. Once treated, the down is over 375 times more durable than untreated down, extending its lifespan. It's also much more water-resistant, delivering a shake test result of 15,000 minutes for virgin down, whilst also improving the down's fill power by up to 5%, overall keeping you warmer for longer.
Can't quite catch the lingo? Here's a quick breakdown.
Fill power - Fill power measures the warmth and efficiency of the down, alongside its ability to loft (fluff up). A rating of 800 fill power means that 1oz of this down fills 800 cubic inches of space when fully lofted.
R.D.S - The Responsible Down Standard ensures that the down is sourced from happy birds who haven't been plucked and have been well cared for.
Hydrophobic - Hydrophobic down dries out and lofts more quickly than untreated down, resisting moisture from sweat and condensation that may build up when you're catching z's in the bag. Fluorocarbon-free Hydrophobic finishes don't use harmful chemicals that cause damage to the environment, an excellent feature for more eco-conscious adventurers.
Outer fabric: The outer shell of this sleeping bag is made from Pertex® Quantum Ripstop in two thicknesses. 10D is used across the main body of the bag, with 20D reinforcements to the foot box and hood.
This material is tightly woven, with 70D ripstop fibres throughout to help prevent tears and snags whilst maximising the thermal efficiency of the insulation by helping down to fully loft. Pertex® Quantum is soft to the touch with a unique texture that feels more robust and durable than other materials of the same denier, while still being fully windproof to retain warmth.
The material is finished with a fluorocarbon-free DWR (durable water repellent) coating to provide protection from light moisture and protect the filling in cold, damp environments.
Lining: The sleeping bag is lined with 20D Recycled Nylon to provide a lightweight, breathable layer that still feels soft and cosy next to skin, that's still robust enough to deal with a lifetime of use.
What are its features?
Starting with the bag's structure, Rab have used a L.O.F.T 3D™ baffle construction that features offset baffles that have been cleverly built with a twisted helix shape to create funnel points that prevent the down from migrating inside the chambers and make the down more effective. This patented technology eliminates cold spots across the bag, allowing Rab to achieve the same warmth with less down, creating a lighter and more packable sleeping bag.
Longitudinal baffles across the chest maximise the distribution and thermal efficiency of the down, making it just as comfortable, whichever position you like to sleep in.
Sidewall baffles provide maximum loft and comfort for side sleepers, whilst a tapered mummy shape provides optimal thermal efficiency and minimal pack size.
A roomy, anatomically shaped footbox offers freedom of movement around the feet and a more relaxed sleeping position for maximum comfort, allowing the shape of the bag to feel less restrictive without adding much weight or bulk to the overall design.
An anatomically fitted hood with a drawcord closure allows you to cinch it in close on cold nights for maximum thermal efficiency, whilst a 3D shaped synthetically filled neck collar helps to trap heat inside the sleeping bag.
The sleeping bag is fastened with a two-way 3/4 YKK® anti-snag main zip with a down-filled baffle running alongside to prevent cold from entering the bag via the zip. Anti-snag zip inserts and an anti-snag internal zip guard help to prevent the fabric from getting caught and snagging or tearing on the zip.
Two storage sacks are provided with this sleeping bag. One larger zipped storage sack with a water-resistant base provides optimum home storage, giving the bag more breathing room to protect the down and help increase its overall performance and longevity. The other is a lightweight drybag stuff sack for compact storage on the move with minimal bulk. Stuff sacks are literally meant to be stuffed! So do your best to cram your sleeping bag inside instead of folding the bag neatly away. Stuffing randomly helps to prevent folds and creases in the down, which will prevent cold spots and gaps from developing over time, increasing the lifespan of the bag.
Features
- Weight-saving L.O.F.T 3D™ baffle technology reduces down migration, optimising heat retention and reducing pack size
- Longitudinal chest baffles for increased thermal efficiency
- Anatomically fitted hood with drawcord adjustment to maximise comfort and heat retention
- Internal cordlocks positioned below the collar bone for greater side sleeping comfort
- Sidewall baffle construction for increased down loft and greater side sleeping comfort
- 3D shaped down-filled neck collar
- 2-way YKK® 3/4 length main zip with down-filled baffle
- YKK® anti-snag zip insert and anti-snag internal zip guard
- Anatomically shaped foot box for relaxed sleeping posture
- Lightweight dry bag compression stuff sack
- Zipped storage sack with water-resistant base for home storage
- Hand-filled in Derbyshire UK
- Tapered mummy shape
10D x 70D Reinforced Ripstop Pertex® Quantum The 10D Ripstop Pertex® Quantum outer is reinforced with 70D ripstop fibres throughout to increase the material's durability and help prevent tears and snags over time. The result is a lightweight, textured outer fabric that feels more robust than other materials of the same denier.
L.O.F.T 3D™ Baffle Construction The Neutrino's offset baffles feature a twisted-helix design, which creates funnel points within the baffles that prevent the down from migrating within the chambers, allowing it to loft more effectively. This patented technology eliminates cold spots across the bag, allowing Rab to achieve the same level of warmth with less down, resulting in a lighter and more packable sleeping bag.
Hand-filled in Derbyshire, UK This sleeping bag is hand-filled in Derbyshire, UK with premium 800FP European goose down for maximum loft and insulation. By filling the sleeping bag in the UK, Rab prevents any pre-compression in transport, preserving the down’s natural loft for superior warmth and comfort for your first overnight adventure.
FAQ
What temperature range is the Rab Neutrino -18 °C / 0 °F sleeping bag rated for?
The Neutrino is rated with a comfort temperature around ‑10 °C and a lower limit of about ‑18 °C / 0 °F, meaning it’s suitable for cold‑weather camping and alpine conditions.
What type of insulation does this Rab sleeping bag use?
It uses 800‑fill‑power European goose down with a hydrophobic treatment, giving excellent warmth‑to‑weight performance while helping the down resist moisture.
How does L.O.F.T 3D™ baffle construction improve warmth?
The L.O.F.T 3D™ baffle design minimises down migration and cold spots, optimising heat retention so the bag stays efficient and warm without unnecessary bulk.
Is this sleeping bag suitable for winter or mountaineering trips?
Yes, the Neutrino’s thermal rating and lightweight build make it well‑suited for alpine ascents, high‑altitude trekking and winter expeditions where cold‑weather performance matters.
What comfort and design features help with sleep quality?
It includes an anatomically fitted hood with drawcord, down‑filled neck collar, sidewall baffles and an anatomically shaped foot box, all engineered to trap heat and improve overall comfort in cold conditions.