The Phenix Mash IV Jacket is 10,000 waterproof and breathable and insulated with Phenix Nestlation making it very warm. This jacket has the adjustable SukuSuku grow system making this jacket a great investment as it will grow with your child. The sizes stretch across three size groups. There is a detachable hood, multi purpose pocket, an ID label and ski pass pocket and an inner hem adjustor.