The Willum is a Norse Projects staple, inspired by the Everest Parka's origins, a classic of mens outerwear. Redesigned with increased pocket storage, and a more ergonomic fit. This jacket is constructed with Pertex Quantum. Pertex® Quantum uses a tightly woven structure to provide a light and soft windproof fabric that allows insulation to fully loft. This construction is designed to trap still air and improve the efficiency of insulation.