If you need an unparalleled warmth-to-weight ratio for the coldest conditions on Earth, then the EXPDN Down Jacket, developed in collaboration with Arctic explorer Eric Larsen, is just what you need. With a powerful 1000 fill power Expedry down insulation and lightweight, yet wind- and down-proof Pertex Quantum fabric, it is compact enough for Eric's polar expeditions and features special elements compatible with a climbing harness, such as high-set hip pockets and side zippers.