High-altitude Trekking/ Climbing Material: WINDSTOPPER+CORDURA / 92% Nylon, 8% Spandex Lining: Fleece-lined High-performance softshell designed for high-altitude trekking, combining windproof, water-repellent, and warm insulation with high breathability and stretch. Zone design: windproof insulation zone, breathable insulation zone, and ventilation zone. Windproof zone uses WINDSTOPPER membrane by GORE-TEX LABS for a durable water-repellent outer, and lightweight fleece-lined interior for warmth against high-altitude winds. Back zone uses breathable insulation fabric. Underarm ventilation zone uses CORDURA fabric to enhance sweat evaporation while reducing pilling from backpack and equipment friction. Grade: S+ Moisture Permeability: 6731 (g/(m2.24h)) GB/T 12704.2-2009 Weight: 488g Fit: Athletic