The Ice Peak 150 is the lightest model of the series and for 3-season sue. For extreme alpinists use for high alpine touring and expeditions - lightweight fabrics with water repellent treatment - 90/10 GDD 650 cu in - high quality grey duck down from Europe - body contoured mummy cut for optimal heat management - pillow compartment inside the hood - long side zip down to the foot section - with large inner pocket made from soft mesh fabric.