Its outer is made from Pertex Quantum, a durable windproof fabric that's soft, breathable and comfortable. Lined with recycled nylon and filled with 650 fill power responsibly-sourced hydrophobic duck down, the bag benefits from high-grade materials throughout.Rab have used their expertise in sleeping bag technology to eliminate cold spots and maximise loft. A 3D collar seals in your warmth while a chevron baffle design evenly distributes it. A narrow mummy shape and angled footbox provides a snug sleeping environment and cuts down on pack space and weight, perfect for overnight adventures.Three season down-filled sleeping bag 650 fill R.D.S Certified European Duck Down with Nikwax fluorocarbon-free Hydrophobic Finish - maintains performance in damp conditions Pertex Quantum fabric - soft, lightweight and windproofFluorocarbon-free DWR - sustainably water resistant Recycled nylon liningWeight-reducing chevron baffle design Trapezoidal boxwall construction maximises loft and warmth3D neck collar withj drawcord seals in warmthCompact stuffsack and relaxed cotton sack included Hand filled in the UK Weight : 1.05kgComfort limit: -5cRab Sleep Limit: -9c Pack Size : 40 X 22cm / 15.7 X 8.7 Inches