Rab Mythic Ultra 360 Down Sleeping Bag

-7°C Comfort Limit (EN13537:2016), 360g of 900+ Fill Power Hydrophobic Down (US Method)
Weighs 606g (excluding stuff sack)
Code: SS20252
  • £699.99
  • (FREE UK & EU Delivery)
Item out of Stock | Usually dispatched within 24 hours

We're working out what we think - we'll add our view here!

Rab says:

With a category redefining warmth to weight ratio the Mythic Ultra sleeping bag redefines what is possible.

|Click here for more info on Rab, product updates and New Season information.

We're working out what we think about Rab's Mythic Ultra 360 Down Sleeping Bag, we'll add our comments here in due course.

- 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.
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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
  • Super lightweight 7D Ripstop Nylon Outer Fabric
  • Super lightweight 7D ripstop nylon with thermo ionic lining technology (TILT), heat reflecting to boost warmth
  • 900+FP 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
  • Trapezoidal chamber design to eliminate cold spots
  • Proportionally designed differential cut
  • Anti snag bonded zip guard
  • Ergonomically designed internal collar and hood
  • Angled foot box
  • ½ length YKK® 3 coil main zip with noctilucent puller
  • Lightweight Dry bag compression stuff sack
  • Cotton storage sack
  • Filled in Derbyshire UK
  • Left zip only
  • Temperature tested to new European standard: EN1357:2016

Temperature Rating

  • EN13537:2016 Comfort: °C
  • EN13537:2016 Comfort Limit: -7°C ( 20°F)
  • EN13537:2016 Extreme: °C
  • EN13537:2002 Rab Sleep Limit: Limit; -8°C ( 18°F)

Regular Specs

  • Weight: Rab's Factory Weight - 606g (excludes storage & stuff sack)
  • Packed size:  x cm
  • Fill weight: 185g
  • Max user height: 185cm
  • O/A length: 215cm
  • Shoulder width: 70cm
  • Hip width: 52cm
  • Foot width: 41cm


  • Shell Fabric: 7D Ripstop Nylon
  • Liner Fabric: 7D ripstop nylon with thermo ionic lining technology (TILT)
  • Insulation: 900+ FP R.D.S. Certified European Goose Down

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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