Whether you're planning an expedition in extreme conditions, or somewhere that the temperature could plummet during the night, the Softie Antarctica is our most extreme performance bag. Keeping you warm and dry are the main priorities in these conditions. We use a combination of highly water repellent Isodry fibers and our metallized, Reflectatherm fabric designed to reflect heat and retain warmth, along with a luxurious layer of Softie insulation next to the skin to make sure this bag delivers on its promises.