Built With Our Team Of World-Class Alpine Guides For Himalayan Climbing, This Updated, Streamlined Version Of Our Original Down Suit Reduces The Weight By 27% While Still Maintaining The Critical Warmth Needed In The Most Inhospitable Conditions. Tested On Mt. Everest And Other 8000ers, It Features A Superior Pertex® Endurance Ripstop Nylon Shell And 800 Fill Premium Goose Down Insulation.