In fusion physics, energy is released when two atomic nuclei are combined. In Patagonia physics, soft, warm pile and water resistant nylon are combined but you make the energy. Because it is so breathable, the Fusion Jacket provides the broadest comfort range of any jacket we offer - and so requires fewer layering adjustments throughout the winter months. Its insulation and shell fabrics (microfiber nylon shell with 1/8'-inch pile lining) don't retain moisture, leaving you warm and dry despite your energy output. The cut is feminine and the details include a drawcorded visibility hood that disappears into the collar, zippered handwarmer pockets, stealth chest pocket, mini powder skirt and drawcord hem. Imported. W's Fusion Jacket