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Mythic Ultra 180 Down Sleeping Bag


The Mythic Ultra 180 redefines what it means to be ‘ultralight’. Using a world-first, heat-reflective fabric treatment called Thermo Ionic Lining Technology, this is premium protection for those counting every last gram

Weight : 400g / 14oz
Rab Sleep Limit : 0C / 32F
Pack Size : 32 x 16cm/12.6 x 6.3 inches
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The Mythic Ultra 180 redefines what it means to be ‘ultralight’. Using a world-first, heat-reflective fabric treatment called Thermo Ionic Lining Technology, this is premium protection for those counting every last gram

Designed and constructed by our in-house technicians on the back of 40 years of hard-won mountain expertise, the award-winning Mythic Ultra 180 is one of the world’s most advanced lightweight sleeping bags. Though constructed with an exceptionally light ripstop 7D outer and filled with high-loft 900+ fill power European goose down, the really special part is the inner lining. This incorporates world-first Thermo Ionic Lining Technology (TILT), which adds a titanium coating to the fibres to reflect heat back towards your body, enabling it to significantly boost warmth without increasing weight, compromising breathability or sacrificing any features.

Weighing just 400g, the stripped back insulation of our TILT-equipped Mythic Ultra 180 is the ultimate expression of performance without penalty.

TILT - Thermo Ionic Lining Technology

TILT technology was born out of a desire to improve heat retention without adding extra weight. TILT stands for Thermo Ionic Lining Technology, it is a heat-reflective fabric treatment designed to substantially reduce radiant heat loss without any compromise to pack size or breathability. Taking our inspiration from technology used in space exploration and emergency blankets, we have created a new Titanium 7D fabric. The fibres of this fabric have been specially coated with titanium which reflects heat back towards the body and reduces radiant heat loss by up to 32% when used as a lining, or 15% when built in to the lining.



Light Ultralight

Pack Size

Moderate Pack Size Ultra Low Pack Size

Environment Use

Cold Extreme Cold

These ratings compare our products to each other. All our products, at any rating, are of the highest quality.


Fast & Light Adventures

Key Specs

  • Weight:400g / 14oz
  • EN (13537:2012) Temperature rating:Rab Sleep Limit; 0°C (32°F)
  • Rab Sleep Limit:0°C / 32°F
  • Insulation Type:900FP European Goose Down with Nikwax Fluorocarbon-Free Hydrophobic Finish (180g / 6.3oz)
  • Product Code:QSI-34


  • 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 European Goose Down
  • Rab® Fluorocarbon 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
  • 1/8 length YKK® 3 coil main zip with noctilucent puller
  • This down is RDS certified by Control Union 839597.
  • Cotton storage sack
  • Filled in Derbyshire UK
  • Left zip only
  • Pack Size: 32 x 16cm/12.6 x 6.3 inches
What is TILT?
Qu’est-ce que le traitement TILT ?
Was ist TILT?
The inner lining uses Thermo Ionic Lining Technology (TILT) which reduces radiative heat loss by reflecting heat back towards the body resulting in increased levels of warmth. This dramatically increases the Mythic Ultra’s warmth-to-weight ratio without changing the original fabric’s properties or increasing weight.
La doublure intérieure comprend la technologie Thermo Ionic Lining (TILT) qui réduit les pertes de chaleur radiative tout en réfléchissant la chaleur pour la renvoyer en direction du corps, ce qui permet d’offrir des niveaux de chaleur plus élevés. Cela augmente le ratio chaleur/poids du Mythic Ultra de façon spectaculaire, sans changer les propriétés de son tissu original, ni augmenter son poids.
Das Innenfutter mit Thermo-Ionen-Futtertechnologie (Thermo Ionic Lining Technology – TILT) reduziert den Strahlungswärmeverlust, indem sie die Wärmestrahlung zurück in den Schlafsack reflektiert. So wird für wohlige Wärme gesorgt. Dies optimiert das Wärme-Gewicht-Verhältnis, ohne die ursprünglichen Eigenschaften des Gewebes oder das Gewicht des Schlafsacks zu beeinträchtigen.


Rab ships throughout the EU Europe via DPD. Orders over €50 qualify for Free Shipping, otherwise, a flat rate of €8.00 will be charged per order under €50. We will aim to ship orders placed Monday - Friday before 1:00 pm the same day, although this is not guaranteed. Orders placed on weekends will ship on the following Monday

For more information regarding shipping, including shipping charges and estimated delivery times, please visit our help centre.


If you are unhappy with your purchase, please return it to us within 28 days of receipt. The item(s) must be in resalable condition with tags attached. We are currently unable to exchange items and will refund products returned to us under the policy above.

Please note, we are not able to accept returns for underwear unless the product is faulty or damaged. We advise that you use a recorded courier service to return your item(s) as we cannot be responsible for items lost in the post.

For more information regarding returns and warranty, please see our help centre.

Mythic Ultra 180 Down Sleeping Bag Reviews