Mountaineering / Expedition / Mountain Basecamp Main Fabric: ZERO-Gravity Ultralight Fabric Insulation: 900 Fill Power Hydrophobic Goose Down Inspired by gear used on all fourteen 8,000m peaks, engineered for an exceptional warmth-to-weight ratio in high-altitude missions. Filled with premium 900-fill-power goose down, providing reliable insulation in extreme cold environments. ZERO-Gravity ultralight fabric delivers breathable, lightweight performance with high-density down chambers for consistent insulation. Hydrophobic-treated down and breathable shell help reduce moisture buildup. Elastic cuffs and hem create a secure, wind-resistant seal. Interior pocket doubles as a self-stowing compression sack for easy packing. Fit: Slim Weight: 237g