“If you’ve ever wanted the comfort of a down bag without the worry of being waterlogged in the soggy Southern Appalachians, Sierra Designs now has you covered.  The Zissou 15 features a new DwrDown filling – regular goose down treated with a hydrophobic polymer to keep moisture to a minimum.  While not completely waterproof, the bag dries faster than normal down and maintains better loft in humid conditions.”