The Helly Hansen ''Component Insulation System'' has a great cross over potential as the zip out inner jacket is inter-changeable with all our CIS compatible midlayers. The Squamish rain jacket is a design for active usage through differing temperatures making a versatile package as the outer shell, as well as with the zip out fleece, is wearable on its own. Waterproof, windproof and breathable. Component insulation system 3 in 1. Fully seam sealed. Material: Polyester.