The best puffy in the world? The Arc'teryx Cerium LT Hoodie certainly gets a lot of votes, and here's why. Super warm in a hurry, but not bulky, the Cerium LT Hoodie combines the pure thermal efficiency of 850 fill power goose down with the wicking ability of Coreloft™ in places where you tend to perspire. Elastic cuffs, a drawcord waist and an adjustable StormHood™ keep the elements at bay. Packs down to the size of a Nerf ball in your pack. You know you want this jacket.