Rab's 2026 Sleeping Bag Range
Apr 01, 2026
Rab’s 2026 sleeping bag range doesn’t try to reinvent the wheel; instead, it refines a long-established lineup. The aim is simple: improved warmth-to-weight, more consistent insulation, and reliable performance in the kind of conditions you’ll encounter across the UK and alpine environments.
The key updates are in the construction. L.O.F.T 3D baffling has been rolled out across more of the range, helping to reduce cold spots and keep the down evenly distributed. Combined with TILT lining technology, this improves thermal efficiency without adding bulk. Fabric choices have also been refined, balancing durability and packability where it matters most.
It results in a clear, logical lineup. The Mythic focuses on ultralight performance, the Neutrino offers all-round versatility, the Alpine leans towards durability and protection, and the Ascent prioritises comfort and space.
For a closer look, watch the video below. We visited Rab’s Derbyshire HQ with Paul Messner to get a first-hand look at the updated range
Andy & Paul Messner Visit Rab's Factory
Join Paul Messner and Andy on an exclusive tour of the Rab factory in Derbyshire to get a first look at the new Spring/Summer 2026 sleeping bag lineup. They discover the secrets behind Rab's latest gear innovations, exploring L.O.F.T 3D baffling, TILT technology, the new ISO temperature ratings, and down waterproofing techniques. The video concludes with a live demonstration of a sleeping bag being filled, a walkthrough of the Rab Service Centre, and a visit to the legendary Rab Factory Shop.
Rab's 2026 Sleeping Bag Range Compared
Mythic Sleeping Bags
Mythic -6C / 20F Down Sleeping Bag
● Tapered Fit
● 18cm x 30cm Pack Size
● 1/2 Length Left Zip
● L.O.F.T 3D™ Baffle Technology
● TILT Lining Technology
● 900FP European Goose Down
● Fabric: 10D Pertex® Quantum ripstop
● Fabric lining: 10D Recycled Atmos™
Neutrino Sleeping Bags
Neutrino -6C / 20F Down Sleeping Bag Weighs: 898g (men's regular)
● Tapered Fit
● 18cm x 30cm Pack Size
● 3/4 Length Left Zip
● L.O.F.T 3D™ Baffle Technology
● 800FP European Goose Down
● Main fabric: 10D Pertex® Quantum ripstop on top of the bag
● Secondary fabric: 20D Pertex® Quantum ripstop on base and footbox
● Fabric lining: Recycled 20D nylon
Alpine Sleeping Bags
Alpine -6C / 20F Down Sleeping Bag Weighs: 1110g (men's regular)
● Tapered Fit
● 20cm x 35cm Pack Size
● 3/4 Length Left Zip
● L.O.F.T™ Baffle Technology
● 650FP European Duck Down
● Fabric: 20D Pertex® Quantum nylon
● Fabric lining: Recycled 20D nylon
Ascent Sleeping Bags
Ascent -6C / 20F Down Sleeping Bag
● Wider, More Comfortable Fit
● 20cm x 35cm Pack Size
● 3/4 Length Left Zip
● A Second Short Right Zip
● L.O.F.T™ Baffle Technology
● 650FP European Duck Down
● Fabric: 20D Pertex® Quantum nylon
● Fabric lining: Recycled 20D nylon
What is L.O.F.T and L.O.F.T 3D Technology?
(Lightweight Offset Fill Technology)
L.O.F.T™
Rab uses a trapezoidal baffle construction in a selection of their down sleeping bags to deliver an exceptional warmth-to-weight ratio.
L.O.F.T 3D™
Rab's pinnacle sleeping bag construction, building on their L.O.F.T™ technology by incorporating the same trapezoidal baffles with a unique twisted helix structure.
Why use Offset Baffles?
By offsetting the baffles, they prevent cold spots from appearing along stitch lines and give the sleeping bag more structure, keeping the insulation stable and evenly distributed.
This helps the down to fully loft and work more effectively, providing all-night warmth needed in mountain environments.
To learn more, read our page here: Rab's L.O.F.T & TILT Technology Explained.
Alpine Down Sleeping Bag
Rab's Alpine bag is a slim-fitting, technical down sleeping bag that blends comfort and packability to provide a sound night’s sleep, whether one is high on the summit or deep in the backcountry, on foot or on two wheels. It features a clever construction designed to maximise the performance of the 650FP European duck down, offering more heat for fewer grams. The L.O.F.T™ baffle technology reduces down migration and helps retain warmth while minimising the amount of insulation required, which in turn slashes weight and pack size. Finished with a protective, windproof Pertex® Quantum fabric, this low-bulk bag is ideal for alpine missions in winter conditions.
● L.O.F.T™ construction uses alternating wide and narrow baffles to achieve great warmth for 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 synthetic insulated collar sits snugly around your neck.
● Tapered mummy shape maximises comfort while minimising pack size.
● Two-way zip provides ventilation when you need it, while the insulated zip baffle prevents cold spots when the temperature drops.
● An anatomically shaped footbox allows you to sleep in a relaxed position.
● Internal cordlocks positioned below your collarbone for greater side-sleeping comfort.
Neutrino Down Sleeping Bag
There are endless alpine landscapes waiting to be explored, and the Neutrino sleeping bag is designed to get adventurers there. Offering outstanding warmth for weight with a robust, all-mountain design, it serves as a versatile bag that easily adapts to a range of alpine pursuits, from long-distance treks to rugged winter ascents. Strategically placed fabrics provide maximum durability and loft where needed, creating a hardwearing, hard-working bag that remains super packable and lightweight. Filled with 800FP down in its groundbreaking L.O.F.T 3D™ baffle construction, which eliminates cold spots, it provides the efficient warmth required for technical pursuits on alpine terrain.
● Longitudinal chest baffles provide an efficient way of conserving heat around your torso.
● Pioneering L.O.F.T 3D™ construction features helix-shaped baffles that prevent down migration and maximise heat retention.
● 20D Pertex® Quantum on the base and footbox for durability on rough ground, while 10D Pertex® Quantum on the top increases loft and packability.
● 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.
● Two-way zip provides ventilation when you need it, while the insulated zip baffle prevents cold spots when the temperature drops.
● Internal cordlocks positioned below your collarbone for greater side-sleeping comfort.
Mythic Down Sleeping Bag
Every detail of the Mythic has been designed to reduce weight and bulk, drawing on over 40 years of hard-won expertise. Filled with high-quality 900FP down, it offers superb warmth for its weight, utilising groundbreaking L.O.F.T 3D™ construction. This unique technology uses twisted, helix-shaped baffles to create funnel points within the bag, preventing down migration and keeping it evenly distributed. Combined with a TILT lining that reflects heat back towards the body, this allows for an unrivalled warmth-to-weight ratio. Light on grams but not on functionality, the Mythic is finished with a Pertex® Quantum ripstop fabric to withstand mountain environments. Ultralight, stripped-back, and uncompromisingly warm, it’s ideal for moving fast in cold conditions, from fastpacking to alpinism.
● 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.
● A ½ length zip features an insulated zip baffle to prevent cold spots when the temperature drops.
● Internal cordlocks positioned below your collarbone for greater side-sleeping comfort.
● Anatomically shaped footbox allows you to sleep in a relaxed position.
Thermo Ionic Lining Technology (TILT) Technology
The Mythic Sleeping Bags use a superlight 20gsm fabric which is sprayed with a heat-reflective titanium coating designed to significantly reduce radiant heat loss from the body. It boosts the warmth-to-weight ratio of the bag without compromising pack size or breathability. TILT is positioned as close to the body as possible to reflect heat back towards the user, making the bag considerably warmer for virtually no extra weight.
Ascent Down Sleeping Bag
For those seeking a sleeping bag that prioritises comfort and practicality, the Ascent is a reliable down-filled bag that offers an easy night’s rest in the wild without compromising on weight or pack size. Armed with 650FP duck down, a spacious wide mummy shape, windproof Pertex® Quantum fabric, and clever L.O.F.T™ baffle construction designed to maximise warmth for weight, it’s perfect for trekking and backpacking adventures.
● L.O.F.T™ construction uses alternating wide and narrow baffles to achieve great warmth for weight.
● Sleep comfortably on your side thanks to the sidewall baffles, which reduce cold spots and ensure you’re not lying on a seam.
● A second shorter zip with integrated snap closure allows you to use your arms while retaining heat in your sleeping bag, ideal for cooking in the cold.
● Cinch in the hood to seal in the heat, while the synthetic insulated collar sits snugly around your neck.
● Sleep in a relaxed, comfortable position thanks to the roomy, anatomically shaped foot box.
Keep valuables and essentials close at hand with a zipped internal stash pocket.
● Wide mummy fit gives space for extra layers when night temperatures plummet.
● Internal cordlocks positioned below your collarbone for greater side-sleeping comfort.
Rab’s 2026 sleeping bag range doesn’t try to reinvent the wheel; instead, it refines a long-established lineup. The aim is simple: improved warmth-to-weight, more consistent insulation, and reliable performance in the kind of conditions you’ll encounter across the UK and alpine environments. The key updates are in the construction. L.O.F.T 3D baffling has been rolled out across more of the range, helping to reduce cold spots and keep the down evenly distributed. Combined with TILT lining technology, this improves thermal efficiency without adding bulk. Fabric choices have also been refined, balancing durability and packability where it matters most.