For serious weather protection our roomy Sequoia is available in a tightly woven MicroLite XP shell. The MicroLite XP fabric offers maximum breathability while allowing a high degree of water resistance. These Sequoias have a full down collar solidly stuffed with down to provide a protective seal from the bellows effect as you move about inside your bag. This bag warm down to -15C, yet only weighs 1475g. The continuous baffles allow you to adjust the down fill to suit the changes in weather. Its two zippers not only allow you to zip to mummy bags but also to unzip the foot so that it can lie out flat. Our Sequoias are a perfect choice if you don't like sacrificing elbow room during the most weather prone climates.