The Mammut Men's Eigerjoch Pro IN Hooded Jacket is a heavy-duty insulator that you can count on when you're mountaineering, alpine climbing, or embarking on a frigid expedition. Its innovative insulation includes light, lofty, compressible 800-fill down throughout the body, and Primaloft Gold insulation in key areas more likely get wet from weather. Primaloft Gold maintains warmth even when it gets wet, and it's supremely soft and compressible to ensue easy packing. The jacket's insulated chambers double over one another to eliminate cold spots, and each seam is sealed to retain heat and prevent moisture getting in.