If you can imagine eating a whole cake without feeling an ounce of extra belly weight, then you'll understand the benefits of the La Sportiva Men's Pegasus 2. 0 Primaloft Jacket. Its PrimaLoft Gold fill serves as an extra layer insulation to keep you warm in cold and wet environments, while the lightweight design means you won't feel weighed down when you're on the trail. The Pegasus saves weight thanks to its lightweight nylon fabric and two different fill weights of synthetic insulation in the body and sleeves. The fit of the jacket works well either on its own, thanks to the bound hood, or as a midlayer with stretch cuffs that minimize bulk at the sleeves. The chest pocket is media compatible, so you can run you headphones through the port, while the two handwarmer pockets give your digits a place to stay warm when you're acclimatizing in camp.