Rab Womens Neutrino 400 Down Sleeping Bag

-7°C Comfort Limit (EN13537:2016), 400g of 800 Fill Power Hydrophobic Down (US Method)
Weighs 768g (excluding stuff sack)
Code: SS19638
  • £319.99
  • (FREE Delivery on orders over £15)
  • RRP £344.99
Item out of Stock | Usually dispatched within 24 hours

Intended for situations where warmth-to-weight is a primary concern, the Women's Neutrino 400 is well suited to summer alpine trips and long multiday treks.

Rab says:

The Neutrino range comprises lightweight, minimalist down-filled sleeping bags. Refined to maximum warmth without increasing weight, the updated design has chevron shaped baffles to ensure the down is held over the centre of the body and prevents down migration while the trapezoidal chambers eliminate cold spots.

Perfect for summer alpine climbing, the Women's Neutrino 400 is hand filled in Derbyshire and contains the highest quality 800FP ethically sourced European Goose Down. It is made using the lightweight, yet durable Pertex® Quantum - this allows the bag to have an impressively small pack size but quickly loft for instant warmth. The ‘mummy taper’ shape and angled footbox keep overall weight low without compromising on warmth or comfort and still allow for movement. A women's specific fit ensures optimum performance and ultimate warmth for the female form.

The Women's Neutrino 400 has an 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 to keep out the cold. Other features include a handy internal stash pocket, dry bag compression stuff sack for transport and cotton sack for storage.

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Rab's Neutrino Down Sleeping Bags have seen an update, refining the fabric, design and features to create warmer, yet lighter sleeping bags with an innovative new chamber design allowing more efficient usage of down.

The baffles are now made in a chevron shape which acts to funnel the down to it's correct position as you shake the bag out prior to climbing in. This has also allowed Rab to put one less baffle line into the construction of the bags - saving 10grams of weight. There has also been an obsessive focus on the down chambers themselves, ensuring the chamber size is matched to the down volume to achieve the most efficient loft and therefore insulating value. 

RAB Neutrino versus Neutrino Pro - Rab produces two identical series of bags, the Neutrino and Neutrino Pro. The Pro bags have a Pertex Quantum Pro fabric outer shell which has a high water resistance making it more suited to damp conditions, such as bivying or tarp camping. The standard Neutrino bags use Pertex Quantum fabric for the outer which whilst it doesn't have the water resistance of Quantum Pro it is more breathable - making the bag arguably more comfortable.

What we say is that if you are going to be using a tent all the time then there's no reason to go for the Quantum Pro bags - but if you are camping where damp may be a problem - such as under a tarp - then the Quantum Pro bag is more appropriate.

- Reviewed by Ultralight Outdoor Gear

| RAB Premier Sleeping Bag Stockist - Ultralight Outdoor Gear is a RAB Premier Sleeping Bag stockist. RAB recognises our knowledge and experience when it comes to advising customers about the sleeping bag that would best meet their needs. It also recognises the comprehensive range of RAB sleeping bags that we stock.
Help and advice:
  Choosing a sleeping bag advice
  EN 13537 rating for sleeping bags explained
  Sleeping bag shape and sizes advice
  Sleeping Bag features Page 1
  All about down filling in sleeping bags
  • Pertex® Quantum outer fabric
  • Lightweight Nylon Ripstop inner fabric
  • 800FP R.D.S Certified European Goose Down
  • Rab Flourocarbon free Hydrophobic Down developed in conjunction with Nikwax
  • Weight saving baffle construction, preventing down shift/migration
  • Mummy taper shape
  • Proportionally designed differential cut
  • Trapezoidal chamber design to eliminate cold spots
  • 3/4 length YKK® 5 coil main zip with full length baffle and noctilucent pullers
  • Internal stash pocket
  • Anti snag bonded zip guard
  • Ergonomically designed internal collar
  • Internal 3D 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: EN1357:2016
  • Left zip only

Temperature Rating

  • EN13537:2016 Comfort: -1°C
  • EN13537:2016 Comfort Limit: -7°C
  • EN13537:2016 Extreme: -25°C
  • EN13537:2016 Rab Sleep Limit: -8°C


  • Weight: 768g (excludes storage & stuff sack)
  • Packed size: 18 x 27cm
  • Fill weight: 400g
  • Max user height: 170cm
  • O/A length: 200cm
  • Shoulder width: 68cm
  • Hip width: 54cm
  • Foot width: 41cm


  • Fabric Outer: Pertex® Quantum, 30g/m², 15d/15d, 100% nylon
  • Fabric Inner: 30g/m², 15d/15d, 100% nylon
  • Insulation: 800FP R.D.S. Certified European Goose Down (400g / 14.1oz)

What is the 'RAB Sleep Limit'? - The recognised method of testing sleeping bags is by using the standard EN13537 temperature ratings, which are carried out by independent testing houses. The test is performed with the sleeping bag resting on an insulating mat to simulate the bag in use. The same sleeping mat is used for all testing of all sleeping bags.

RAB's view is that the sleeping mat used is inappropriate for bags designed for very low temperatures because a user would be sleeping on a highly insulative winter orientated sleeping mat, not the standard one used in the test. The test results would therefore indicate a lower performance for the sleeping bag than a user would experience in a typical situation.

RAB have therefore defined their own 'RAB Sleep Limit' as the equivalent 'Comfort limit' but based on their athletes experience and extrapolating results from other bags.

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