Fit & DesignWear it over base-layers for a warm down mid-layer. Wear on it's own for a warm and stylish jacket that can take you from the lounge to the outer decks. Great for travel as it packs down very small. If the Sonata is the featherweight champ, the Sonata Ultra is the newly crowned welterweight winner. Just as technically trim and tough in 22D ripstop as the Sonata, it features the extra punch of 800+ fill power down. Water and wind-resistant, it packs down into its own pocket and the hood adjusts to work easily with a helmet.