The Rab Neutrino 400 is a goose down filled, spring and autumn sleeping bag with a slim fitting, tapered mummy shape.For the alpinist looking for a lightweight, low bulk sleeping bag suited to high altitude camps, the Neutrino offers exceptional warmth for low weight. Built for big mountain bivis, hut to hut stopovers, or multiple nights at basecamp, this sleeping bag is light in your pack and light on the planet, filled with ultra-high lofting down and made with recycled fabrics.Materials & Insulation20D Pertex® Quantum nylon ripstop with fluorocarbon-free DWR800FP R.D.S Certified European Goose Down with Nikwax fluorocarbon-free Hydrophobic FinishISO EN Temperature RatingsRab Sleep Limit: -7°CComfort: -1°CComfort Limit: -7°CExtreme: -25°CFeaturesWeight saving chevron baffle design, reduces down migration and optimises core warmth.Trapezoidal boxwall construction with differential cut, to maximise loft and warmthClose fitting adjustable neck baffle design for decreased heat lossYKK 3/4 length main zip with synthetic filled baffle to trap warmthYKK zipped internal stash pocketAngled foot box for relaxed sleeping postureYKK Anti-snag zip insert and anti snag internal zip guardHand-filled in Derbyshire UKZipped cotton sack with water-resistant base for home storageWaterproof roll-top compression sack includedTapered Mummy ShapeExtra wide widthLonger LengthA closer lookDesigned for maximum warmth, the chevron shaped baffles ensure the down is held over the centre of the body and prevent down migration, while the trapezoidal chamber design eliminates cold spots. Cut to have a ‘mummy taper’ shape and angled foot box; this bag has a low pack size and weight without compromising on warmth or comfort and still allows for movement. An ergonomically designed, close-fitting internal collar with a hood drawcord, as well as a 3/4 length YKK anti-snag zip with an insulating draft tube to keep out the cold. Comes with a dry bag compression stuff sack for transport and cotton sack with water-resistant base for storage.Hand Filled In Derbyshire. Rab hand fill all their down sleeping bags at their factory in Derbyshire, UK. This ensures that every baffle is filled as required and that the down within has never been compressed or stored in a way that could impair performance. The bags are filled using a smaller diameter pipe and a compressed air system, which blows the feathers into each chamber. Before the bags are filled, one empty shell from each batch is weighed to ensure they are within tolerance. Precision scales are then used to measure the down for each chamber and, once complete, the finished bag is weighed again. To avoid being rejected, the bag’s total weight must be less than 10% over and cannot go under the intended weight. Scales are accurate to 0.5g and are routinely re-calibrated using weights of 1000g, 100g, 10g and 1g. Rab Neutrino 400 Sleeping Bag - Long Wide