A warm, light, and windproof Down insulated jacket for high-altitude ascents. Designed for and used by speed climber Ueli Steck, the Nilas features 850-fill Q.Shield DOWN that resists moisture to retain critical loft and warmth even in damp conditions. AirShield technology keeps the wind at bay so that even when it's howling, it's always calm and dry inside the Nilas. Body Fabric Content: 100% Nylon.