Rab Mythic -12C / 10F

Engineered for extreme warmth with minimal weight, the Rab Mythic (-12°C) is a high-performance ultralight sleeping bag designed for fast-moving alpine missions and cold-weather expeditions. Every element is optimised to reduce bulk and maximise thermal efficiency, making it ideal for alpinists, fastpackers, and mountain athletes who prioritise speed and efficiency.

Filled with premium 900 fill power down, the Mythic delivers exceptional warmth-for-weight performance. Its advanced L.O.F.T 3D™ construction uses innovative helix-shaped baffles that create internal funnel points, preventing down migration and ensuring even insulation distribution throughout the bag. This results in consistent warmth with minimal insulation weight.

A key feature is the integrated TILT (Thermo Ionic Lining Technology), which reflects radiant heat back toward the body, significantly improving thermal efficiency without adding bulk. The outer shell is made from lightweight Pertex® Quantum ripstop fabric, offering durability and wind resistance in harsh alpine conditions. Hand-filled in the UK, the down has never been pre-compressed, preserving maximum loft and long-term insulating performance. Built for serious cold environments, the Mythic is one of Rab’s most advanced ultralight sleeping bags.

• Pioneering L.O.F.T 3D™ construction features helix-shaped baffles that prevent down migration and maximise warmth retention.
• Built with a heat-reflective TILT lining, minimising radiant heat loss for virtually no extra weight.
• Sleep comfortably on your side thanks to the sidewall baffles, which reduce cold spots and ensure you’re not lying on a seam.
• Cinch in the hood to seal in the heat, while the down-filled collar sits snugly around your neck.
• The tapered mummy shape is incredibly efficient on pack size.
• ½ length zip features an insulated zip baffle to prevent cold spots when the temperature drops.
• Internal cordlocks positioned below your collar bone for greater side sleeping comfort.
• Anatomically shaped foot box allows you to sleep in a relaxed position.
• Lightweight dry bag compression stuff sack.
• Zipped storage sack with water-resistant base for home storage.
• Hand-filled in Derbyshire UK.

SPECIFICATIONS:

Weight: 920g/2lb 0.45oz

Insulation: 900FP European goose down with Grangers fluorocarbon-free hydrophobic finish (590g / 20.8oz)

Main fabric: 10D Pertex® Quantum ripstop (26g/m²) with fluorocarbon-free DWR

Fabric lining: 10D Recycled Atmos™ (28gsm) with Thermo Ionic Lining Technology (TILT)

ISO (23537-1:2022) temperature rating: Comfort: -5°C (23°F), Limit of comfort: -12°C (10°F), Extreme: -33°C (-27°F)

Limit of Comfort: -12°C / 10°F

Packed size: 20cm x 35cm (7.9in x 13.8in)

Product code: QSN-26