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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

Weight : 400g / 14oz
Rab Sleep Limit : 0C / 32F
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.

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.

Key Specs

  • Weight:400g / 14.1oz
  • Temperature:Rab Sleep Limit; 0°C (32°F)
  • 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 R.D.S Certified European Goose Down
  • Rab® Flourocarbon free Hydrophobic Down developed in conjunction with Nikwax®
  • 400g / 14.1oz 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
  • Lightweight Dry bag compression stuff sack
  • Cotton storage sack
  • Filled in Derbyshire UK
  • Left zip only


Rab ships throughout the UK, EU and the United States. All UK orders are shipped free of charge by DPD. Orders placed during the week and before midday will typically be delivered within 48 hours, orders placed on weekends will ship on the following Monday.

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


If you are unhappy with your purchase, please return it to us within 90 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 Sleeping Bag Reviews