Rab Neutrino -6C / 20F Sleeping Bag | Down Sleeping Bag for Alpine Trekking and Mountaineering

Description

The Rab Neutrino -6C / 20F is a down sleeping bag designed for technical mountaineering, alpine trekking, and bivouacs where the balance between warmth, weight, and volume makes all the difference. Within the Neutrino range, it is one of the most versatile models for those seeking a serious sleeping bag for long three-season use or alpine use in spring and autumn.

Its filling of 800FP European goose down, together with the L.O.F.T. 3D™ construction and a strategic combination of Pertex® Quantum and Pertex® Quantum Pro fabrics, offers an excellent warmth-to-weight ratio, a contained compressed volume, and reinforced protection in areas most exposed to wear and moisture.

Real Technical Performance

The Neutrino -6C is designed for trips where staying warm matters, but where you also need the bag to be compact and not penalize your backpack. The L.O.F.T. 3D™ construction uses helical baffles to reduce cold spots and improve down stability, while the longitudinal baffles in the torso help to better concentrate heat in the central body area.

The base and footbox use 20D Pertex® Quantum Pro to provide greater resistance and protection against ground moisture or condensation, while the upper part in 10D Pertex® Quantum promotes loft and keeps weight under control. The result is a very compact, lightweight bag clearly oriented towards real mountaineering, not basic camping.

Quantitative Technical Specifications

• Weight: 870 g / 1 lb 14.69 oz
• Fill: 800FP European goose down with Grangers fluorocarbon-free hydrophobic finish (400 g / 14.1 oz)
• Main Fabric: 10D Pertex® Quantum ripstop nylon (26 g/m²) with fluorocarbon-free DWR
• Secondary Fabric: 20D Pertex® Quantum ripstop nylon (38 g/m²) with fluorocarbon-free DWR
• Lining: Recycled 20D nylon, 38 g/m²
• Comfort Temperature: 0°C / 32°F
• Limit Temperature: -6°C / 21°F
• Extreme Temperature: -24°C / -11°F
• Compressed Size: 18 cm x 30 cm (7.1 in x 11.8 in)
• Product Code: QSN-16

Comparison within the Range

Compared to the Neutrino 0C, this model adds a clear thermal margin for colder nights, higher altitudes, or more serious mountain conditions. Compared to the Neutrino -12C, it maintains a more versatile and less extreme proposition, very suitable for those who want a single technical bag for a good part of the year in an alpine environment.

Compared to the Mythic Ultra range, it prioritizes a more robust construction and more transversal use. Compared to a synthetic bag like Radeon, it offers better compressibility and a superior warmth-to-weight ratio, although it requires more care if use will be very frequent in persistently humid environments.

Recommended Use

• Alpine trekking and mid-to-high mountain traverses
• Bivouacs in spring, autumn, and summer at altitude
• Lightweight mountaineering where reducing weight and volume matters
• Users looking for a technical, compact, and versatile down bag within the Rab range

Is it for you?

Yes, if you are looking for a technical down sleeping bag with a very good warmth-to-weight-to-compressibility ratio. Yes, if you go mountaineering with a backpack and want a reliable model for cold nights without moving to a clearly winter bag. No, if your priority is carefree use in humid environments or highly variable camps; in that case, a synthetic alternative might be a better fit. No, if you need insulation for harsh winter conditions or very cold high mountains, where it's advisable to move up to the next thermal level.