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Rab Neutrino Endurance 400

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The Rab Neutrino Endurance 400 with hydrophobic down is a more durable weather resistant version of the standard Neutrino 400. As with its name sake, the Endurance features hydrophobic European goose down with an 800 fill power and a roll-top waterproof compression stuff sac, however it differs byway of the Pertex Neutrino Endurance outer: which repels water and snow more effectively, as well as providing slightly more durability. The Neutrino 400 is aimed at summer alpinism and lightweight mountaineering, as well as proving ideal for lightweight backpacking and cycle tours. Utilising a tapered mummy shape and cutting edge materials they greatly reduce weight and maximise warmth.

Remember, temperature ratings are used to indicate a bags performance and help you decide between models. However, they are subjective and can be greatly affected by factors such as what you're happy to wear (clothing wise) in conjunction with the bag, your health and metabolism, how much you have had to eat or drink, humidity and altitude, the type of shelter used and whether you are using a suitable insulating mat.

As a guide, the "Comfort" rating indicates the range at which a woman gets a comfortable night’s sleep, the "Limit of Comfort" rating indicates the range at which a man gets a comfortable night’s sleep and the "Extreme" rating indicates a range at which a woman is protected from hypothermia. The Extreme rating is basically a survival rating and it is not advisable to rely on this for general use.

More Help? For further assistance on choosing your down sleeping bag, please view the various help videos available under the 'Videos' tab above. We also have an article explaining fill power, the pros and cons of down over synthetic insulation and more info on caring for your bag available to view here: Down Sleeping Bags.


Pertex® Endurance outer fabric
Pertex Quantum® inner fabric
Pertex® Endurance inner fabric in hood and collar
800FP European Goose Down
Rab® fluorocarbon free Hydrophobic Down developed in conjunction with Nikwax®
Improved close fitting neck baffle design
Mummy taper shape
Proportionally assigned differential cut
Internal YKK 3 coil zipped stash pocket
¾ length YKK 5 coil main zip
Left and right hand zips available
Anti snag zipper webbing tape
Internal collar and hood drawcord
Trapezoidal baffle chamber design
Angled foot box
Dry bag compression stuff sack
Cotton storage sack
Temperature tested to new European standard EN13537: 2012
Hand filled in Derbyshire UK

Perfect for: Lightweight mountaineering, Backpacking and Cycle Tours.


  • Compressed Size: 32 x 17 cm
  • Length: 220cm
  • Manufacturer: Rab
  • Fill Power: 850+US European Fluorocarbon Free Hydrophobic Goose Down
  • Weight: 890g

Customer Reviews

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  • Reviews (8)
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Charlotte H.
United Kingdom

Good but

Love the bag - great service for Rock & Run, but the temperature ratings are not my experience. A bit cool for me when the temp was well above freezing. However, it’s warmer than my old one and very light & compressible & comfortable & having both a storage sack & a stuff sack/dry bag is fab.

Philip L.
United Kingdom

New sleeping bags

Good prices excellent service and well made - ideal for three seasons

Gary B.
United Kingdom

Fantastic bag

First use was wild camping on the Lakeland fells - how was it? The bag is light weight, packs down small, easy to carry. Had a comfortable and warm nights sleep at about 2 degrees

louise a.
United Kingdom

Excellent Sleeping Bag

I bought the Rab Neutrino 400 Sleeping Bag for my husband as he was always asking to borrow my Rab neutrino 600.The bag is is very well made and excellent quality.Looked after these sleeping bags will last a lifetime.I would strongly recommend.Got a great price from Snow and Rock.

Paul K.
United Kingdom

Exactly as is says on the tin!

Quality product from RAB. Packs small and comes with a waterproof stuff sack. The outer is lightweight but robust enough to keep the wind etc out.I haven’t pushed it to the extreme yet and I certainly wasn’t hot in +6 degs, so I would think you’d need a good base layer to be comfortable at it’s stated limits, exactly as it says ‘on the tin’.


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