We find this suitable for
TILT Lining Offers a Boost of Warmth The Mythic is lined with a 10D recycled Atmos™ fabricthermo ionic lining technology (TILT). This clever technology utilises titanium-coated nylon fibres to create an almost 'foil blanket' effect to reflect your natural body heat back to you, increasing the bag's warmth by 30% without adding a gram of weight!
What is the Mythic -12°C / 10°F ?
It's an ultralight, super-warm, technical sleeping bag that utilises 900FP hydrophobic goose Down, TILT lining and Rab's patented construction techniques for an unparalleled warmth-to-weight ratio. It's engineered for maximum performance with minimal weight, ideal for gnarly alpine missions and challenging multi-day adventures where low weight and pack size are critical.
What is it made from?
Insulation: The Mythic is filled with 590g of 900 fill power European Goose Down for maximum loft (fluffiness) and insulation.
European Goose Down is some of the highest quality down on the current market, making this sleeping bag super high grade and efficient for keeping the heat in. The bag is also hand-filled in the UK to ensure the down has not been compressed before use to retain its loft for your first epic adventure.
The down is treated with a Grangers fluorocarbon-free Hydrophobic finish, which adds light water-resistance to the down itself.
Grangers Down Defend is a bluesign-approved hydrophobic treatment that helps keep down lofted in damp conditions. Once treated, the down is over 375 times more durable than untreated down, extending its lifespan. It's also much more water-resistant, delivering a shake test result of 15,000 minutes for virgin down, whilst also improving the down's fill power by up to 5%, overall keeping you warmer for longer.
Can't quite catch the lingo? Here's a quick breakdown.
Fill power - Fill power measures the warmth and efficiency of the down, alongside its ability to loft (fluff up). A rating of 900 fill power means that 1oz of this down fills 900 cubic inches of space when fully lofted.
R.D.S - The Responsible Down Standard ensures that the down is sourced from happy birds who haven't been plucked and have been well cared for.
Hydrophobic - Hydrophobic down dries out and lofts more quickly than untreated down, resisting moisture from sweat and condensation that may build up when you're catching z's in the bag. Fluorocarbon-free Hydrophobic finishes don't use harmful chemicals that cause damage to the environment, an excellent feature for more eco-conscious adventurers.
Lining: The lining uses a 10D recycled Atmos™ fabric with thermo ionic lining technology or TILT for short. This clever technology utilises titanium-coated nylon fibres to create an almost 'foil blanket' effect whereby your natural body heat is reflected back to you, increasing warmth by 32% without adding a gram of weight. And no, it doesn't feel like a foil blanket, it feels the same as a normal sleeping bag lining! Neat, Right?
Outer fabric: The outer shell of this sleeping bag is made from 10D Pertex® Quantum Ripstop for high levels of durability with minimal weight. This ultralight material features 70D ripstop fibres tightly woven throughout to help prevent tears and snags whilst maximising the down's ability to fully loft. Pertex® Quantum ripstop is soft to the touch with a unique texture that feels more robust and durable than other materials of the same denier, while still being fully windproof to retain warmth.
This fabric is treated with a fluorocarbon-free, durable water repellent (DWR) for light weather resistance in slightly harsher conditions. It's also super handy for accidental drink spills inside the tent or if you get caught out in a sudden shower when setting up your kit.
What are its features?
Starting with the bag's structure, Rab have used a L.O.F.T 3D™ baffle construction that features offset baffles that have been cleverly built with a twisted helix shape to create funnel points that prevent the down from migrating inside the chambers and make the down more effective. This patented technology eliminates cold spots across the bag, allowing Rab to achieve the same warmth with less down, creating a lighter and more packable sleeping bag.
Sidewall baffles provide maximum loft and comfort for side sleepers, whilst a tapered mummy shape provides optimal thermal efficiency and minimal pack size.
An anatomically fitted hood with drawcord closure allows you to cinch it in close on cold nights for maximum thermal efficiency, whilst a 3D shaped down-filled neck collar helps trap heat inside the sleeping bag.
The sleeping bag is fastened with a lightweight 1/8 length YKK® 3 coil main zip with a down-filled baffle running alongside to prevent cold from entering the bag via the zip.
An anatomically shaped footbox offers more space around the feet and a more relaxed sleeping position for maximum comfort, allowing the shape of the bag to feel less restrictive without adding much weight or bulk to the overall design.
The Mythic comes with two storage sacks, one larger zipped storage sack with a water-resistant base for optimum home storage, giving the back more breathing room to protect the down and help increase its overall performance and longevity. The other is a lightweight drybag stuff sack for compact storage on the move with minimal bulk. Stuff sacks are literally meant to be stuffed! So do your best to cram your sleeping bag inside instead of folding the bag neatly away. Stuffing randomly helps prevent folds and creases in the down, which will prevent cold spots and gaps from developing over time, increasing the lifespan of the bag.
Features
- 10D Pertex® Quantum allows for greater loft and packability
- TILT lining helps to reflect and reduce heat loss
- Weight-saving L.O.F.T 3D™ baffle technology reduces down migration, optimising heat retention and reducing pack size
- Sidewall baffle construction for increased down loft and greater side sleeping comfort
- Anatomically fitted hood with drawcord adjustment to maximise comfort and heat retention
- Internal cordlocks positioned below the collar bone for greater side sleeping comfort
- 3D shaped down-filled neck collar
- 1/8 length YKK® 3 coil main zip with down-filled baffle to trap warmth
- Anatomically shaped foot box for relaxed sleeping posture
- Lightweight dry bag compression stuff sack
- Zipped storage sack with water-resistant base for home storage
- Hand-filled in Derbyshire UK
- Tapered mummy shape
Grangers Down Defend Packed with Rab’s premium 900 fill-power European goose down, the Mythic Sleeping Bags are treated with Granger’s Down Defend to help protect the down when camping in damp conditions. This bluesign-approved, hydrophobic treatment allows the down to resist moisture for longer, keeping it warmer, drier and lofted for longer.
L.O.F.T 3D™ Baffle Construction The Mythic's offset baffles feature a twisted-helix design, which creates funnel points within the baffles that prevent the down from migrating within the chambers, allowing it to loft more effectively. This patented technology eliminates cold spots across the bag, allowing Rab to achieve the same level of warmth with less down, resulting in a lighter and more packable sleeping bag.
Hand-filled in Derbyshire, UK This sleeping bag is hand-filled in Derbyshire, UK with premium 900FP European goose down for maximum loft and insulation. By filling the sleeping bag in the UK, Rab prevents any pre-compression in transport, preserving the down’s natural loft for superior warmth and comfort for your first overnight adventure.
FAQ
What is the temperature rating of the Rab Mythic -12°C / 10°F sleeping bag?
The Mythic is rated around -12 °C / 10 °F (sleep limit) with a comfort temperature closer to -5 °C, making it suitable for cool three-season and mild four-season conditions.
What type of down insulation does the Mythic sleeping bag use?
It uses 900-fill-power European goose down with a hydrophobic treatment, which enhances warmth-to-weight performance and moisture resistance during damp nights.
How lightweight and packable is the Mythic -12°C sleeping bag?
This bag is extremely lightweight (sub 1kg) and features ultralight fabrics and advanced baffle construction that let it compress into a small pack size ideal for backpacking and alpine trips.
What design features improve comfort and warmth on cold nights?
The Mythic has an anatomically shaped hood and neck baffle, 3-quarter YKK main zip with down-filled baffle and an ergonomic footbox, all designed to trap heat and reduce heat loss while you sleep.
How does the Rab Mythic -12°C compare to other Mythic sleeping bags?
Compared with previous models like the Rab Mythic Ultra 360 Down Sleeping Bag, the -12°C version uses more down and wider baffles to deliver greater warmth for colder nights at a modest weight penalty, making it a better choice for cooler weather camping and alpine use.