Weight: 840g (Regular), 890g (Long) Insulation: 650FP European Duck Down with Nikwax Fluorocarbon-Free Hydrophobic Finish (400g / 14.1oz) EN (13537:2012) Temperature rating:ISO EN: Comfort: -1°C (30°F), Limit: -7°C (19°F), Extreme: -25°C (-13°F) Rab Sleep Limit: -5°C / 23°F Packed Size: 35cm x 20cm (13.8in x 7.9in) 20D Pertex® Quantum nylon ripstop (36gsm) with fluorocarbon-free DWR Lining: 20D Recycled Nylon (38gsm) 650FP European Duck Down with Nikwax Fluorocarbon-Free Hydrophobic Finish (400g / 14.1oz) Weight saving chevron baffle design on upper torso, reduces down migration and optimises core warmth. Trapezoidal boxwall construction with differential cut, to maximise loft and warmth YKK zipped internal stash pocket 3-dimensional shaped down filled neck collar to seal in warmth YKK 3/4 length main zip with down filled baffle to trap warmth YKK Anti-snag zip insert and anti snag internal zip guard Angled foot box for relaxed sleeping posture Zipped cotton sack with water-resistant base for home storage Drawcord stuffsack included Hand-filled in Derbyshire UK Outer: 100% polyamide. Lining: 100% recycled polyamide Tapered Mummy Shape   Rab's Alpine range is built for the mountains, whether you’re high in the Alps or deep in the Himalayas, on foot or two wheels. Offering a good warmth to weight ratio and a low bulk design, the Alpine 400 is perfect for spring mountain adventures. It is filled with 400g of 650FP duck down and covered with a wind resistant Pertex® Quantum outer with a recycled nylon lining. Engineered to maximise down performance, the Alpine bag has clever construction. Trapezoid boxwall baffles allows the down to fully loft, eliminating cold spots, and maximising warmth. The chevron baffle design improves down stability, distributing the down evenly around the whole body. In addition, the openings on the Alpine bag have been designed to reduce heat loss, with a 3D-shaped, down collar that can be cinched in snugly to trap the heat, and a down-filled baffle along the zip to prevent heat from escaping. Complete with a narrow mummy fit and angled footbox, the Alpine is designed to cut down unnecessary bulk and weight, whilst ensuring a comfortable night’s sleep. Rab Alpine 400 Down Sleeping Bag (-5C) | GWC