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Rab - Women's Neutrino 400

Availability: Out of stock

Stock #: HM4FZ-
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Intended for situations where warmth-to-weight is a primary concern, the Neutrino 400 is well suited to summer alpine trips and long multiday treks. 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 center of the body and prevents down migration while the trapezoidal chambers eliminate cold spots. Perfect for summer alpine climbing, the 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 foot box keep overall weight low without compromising on warmth or comfort and still allow for movement. The 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.


  • Rab Fluorocarbon free Hydrophobic Down developed in conjunction with Nikwax
  • 730g / 25.7oz saving baffle construction, preventing downshift/migration
  • Pertex® Quantum outer fabric
  • Mummy taper shape
  • Proportionally designed differential cut
  • Trapezoidal chamber design to eliminate cold spots
  • 3/4 length YKK® 5 coils main zip with full-length baffle and noctilucent pullers
  • Internal stash pocket
  • Anti-snag bonded zip guard
  • Lightweight Nylon Ripstop inner fabric
  • 800FP R.D.S Certified European Goose Down
  • Filled in Derbyshire UK
  • Left zip only
  • Ergonomically designed internal collar
  • Temperature tested to new European standard: EN1357:2016
  • Cotton storage sack
  • Dry bag compression stuff sack
  • Angled foot box
  • Trapezoidal baffle chamber design
  • Internal 3D collar and hood drawcord


  • Weight: 730g / 25.7oz
  • Insulation: 800FP R.D.S. Certified European Goose Down: 400g / 14.1oz
  • Limit: -8°C (17.5°F)

Important WARNING for California residents.

Additional Information

Year Spring 2019
Material Pertex® Quantum outer fabric
Insulation 800FP R.D.S. Certified European Goose Down: 400g / 14.1oz
Temp Rating -8°C (17.5°F)
Weight 730g / 25.7oz
Properties Insulating