If you're looking for a high ratio between warmth and weight, you're looking for the Men's Zeus Jacket. Built with an ultralight Ripstop exterior, this Marmot down piece is designed with 800 down fill. With a wind flap behind the front zipper, the Zeus Jacket is easy to compact as it packs down into the pocket. Perfect for layering under a shell, or throwing on towards to the top of a summit, this Marmot down piece is a great a performance must have for the season.