Fully redesigned after extensive lab tests and field tests in Alaska and the Himilayas The North Face Himalayan Suit provides peak performance for extreme high-altitude expeditions. For maximum thermal performance and temperature regulation it pairs 900-fill power Cloud Down with Ventrix stretch insulation in the inner draft flap and strategic zones. This body-mapped insulation combats down compression under our pack to maintain insulation and balances breathability and warmth in areas that are prone to overheating to maintain a more comfortable microclimate whether we're active or resting. A double placket at the chest has an asymmetrical layout that reduces the likelihood of zippers freezing from oxygen mask condensation and it also features a double layer that lets us access a secure zip pocket without letting heat escape or unzip both layers to vent heat and moisture vapor as needed. The seat and lower legs feature FUTURELIGHT with Spectra ripstop for better weather abrasion and puncture resistance and the lower legs feature a 2-piece construction that allows us to adjust the independent shell and insulation layers to our preference--we can wear the shell and insulation both outside of our boots both inside our boots or the insulation inside with the shell outside the boots. On the inside the internal vest features a suspension system to keep the suit in place carry water bottles close to our bodies and distribute weight more evenly across the suit. For additional storage the suit has 11 internal and external pockets to keep things organized and accessible when we're high on the mountain. We may not need to wear the Himilayan Suit all the time so we're happy that the Cloud Down packs down small and that the suit comes with a PU-coated compression sack to save space in our packs. All of the details inside and outside add up to a high-performance suit for our high-altitude expeditions.