What Our Gearhead® Experts Are Saying: "I bring these when conditions are truly cold and there’s no margin for error. They’re warm enough for long stops at basecamp, but still light and packable for big missions. The full-length zips are clutch when pulling them on over boots, and the reinforced seat and knees really matter in harsh conditions."When the cold is relentless and the objective demands absolute reliability, we turn to the Flight Pants. Designed by Western Mountaineering for mountaineering, high-altitude expeditions, and deep-winter environments, these pants provide serious insulation while remaining surprisingly lightweight and packable. They’re built for moments when staying warm isn’t about comfort—it’s about performance and safety. Filled with lofty 850+ fill power goose down, the Flight Pants deliver exceptional heat retention without excess bulk. Reinforced panels at the seat and knees add durability and weather resistance where it matters most, while full-length two-way zippers make on-and-off transitions easy over boots or crampons. From long belays to cold camp mornings, these pants are a critical layer when conditions turn severe.