Tried and trusted by mountaineers everywhere, the Neutrino is a versatile down sleeping bag built to keep you warm, wherever you hunker down.

There are endless alpine landscapes waiting to be explored, and this is the sleeping bag to get you there. Offering outstanding warmth for weight with a robust, all-mountain design, it’s a versatile bag that easily adapts to a range of alpine pursuits, from long-distance treks to fast-moving spring ascents. We’ve strategically placed fabrics to give you maximum durability and loft where you need them, creating a hardwearing, hardworking bag that’s nonetheless super packable and lightweight. Filled with 800FP down in our groundbreaking L.O.F.T 3D™ baffle construction which eliminates cold spots, it provides the efficient warmth you need for technical pursuits on alpine terrain. Hand-filled in the UK, all our down bags benefit from never having had their down compressed before use, preserving its loft and warmth.

Features
• Activities: Fast & light adventures, Mountaineering
• 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 collar bone for greater side sleeping comfort
• Ykk® anti-snag zip insert and anti-snag internal zip guard
• 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
• Fluorocarbon(PFAS)free fabric
• Fluorocarbon(PFAS)free product
• Made with renewable energy

Materials
• Main: 10D Pertex® Quantum Ripstop(26g/m²)with fluorocarbon-free DWR
• Insulation: 800FP European goose down with Grangers fluorocarbon-free hydrophobic finish
• Secondary fabric: 20D Pertex® Quantum Ripstop(38gsm)with fluorocarbon-free DWR
• Lining: Recycled 20D Nylon, 38g/m²

Specifications
• ISO(23537-2:2022)temperature rating: Comfort: 0°C(32°F), Limit of comfort: -6°C(21°F), Extreme: -24°C(-11°F)
Performance
• Lightness: 4/5
• Pack size: 5/5
• Environment use: 2/5