SKU: OC2627V Down Treatment: Standard Fill Power: 850 Fill Weight: 905g (based on size Regular) Insulation Type: Down Weighs: 1590g (Regular) Comfort Limit: -23°C Zip Length: Full Length Zip Position: Left Zip Type: Mummy The Lynx GWS sleeping bags have a Gore Windstopper shell because this makes them more water resistant and so you are less likely to get the down inside the sleeping bag wet - which would be a disaster. Western Mountaine… Lynx GWS Sleeping Bag