Rab have upgraded all their brilliant sleeping bags for the 2014 season with Hydrophobic Down. This flurocarbon free treatment was developed in conjunction with Nikwax & although Hydrophobic Down is not waterproof it dries much faster, absorbs less water & retains loft far better than untreated down. Andes bags are designed for high altitude & winter mountaineering & offer the same performance as the Expedition bags but with a more performance oriented fit & shape to reduce weight & bulk. Hand filled in Derbyshire by Rabs own elite fillers so you can be sure that every Andes bag is made with care & attention. Filled with 800g of 800 fill power Hydrophobic European Grey Goose Down for maximum loft & insulation in a mummy shape which is optimised for bags with fill weights between 800 & 1200g. Longitudinal chest & foot baffles keep the down exactly where its needed, over the apex points of the body, to maximise insulation & to stop the down from migrating to the sides of the bag. Differential cut is a technology developed by Rab to ensure that the space between the lining & the outer fabric is optimised for the specific filling & fill power. This maximises the potential of the down to loft naturally resulting in greater performance. The outer fabric is Pertex Endurance which offers low weight, strength & excellent water resistance. The inner is lined with Pertex Microlight fabric for enhanced comfort & wicking. Both the inner hood & foot areas are lined with Pertex Endurance to provide additional wet protection & abrasion resistance from helmets & boots. Temperature ratings are used to indicate a bags performance but are subjective & can be hugely affected by many factors such as your health & metabolism, how much you have had to eat or drink, how active you have been, humidity & altitude, the type of shelter used & whether you are using a suitable insulating mat. Your sleeping bag is only as good as the mat thats beneath it, we recommend EXPED mats for comfort & insulation. The Comfort rating indicates the range at which a woman gets a full nights sleep, the Limit of Comfort rating indicates the range at which a man gets a full nights sleep & the Extreme rating indicates a range at which a woman is protected from hypothermia. The Extreme rating is basically a survival rating & it is not advisable to rely on this for general use. Pertex Endurance outer fabric Pertex Microlight inner fabric Pertex Endurance inner fabric in hood & foot 800FP European Goose Down Rab fluorocarbon free Hydrophobic Down developed in conjunction with Nikwax enhanced close fitting neck baffle design Longitudinal chest baffles with internal Flowgate technology to control down Face baffle for enhanced hood fit Mummy shape Longitudinal foot baffles to minimise down migration Proportionally assigned differential cut Internal YKK 3 coil zipped stash pocket ¾ length YKK 5 coil main zip Left hand zip only Anti snag zipper webbing tape Internal collar & hood drawcord Trapezoidal baffle chamber design Angled foot box Dry bag compression stuff sack Cotton storage sack Hand filled in Derbyshire UK