The Insulated Storm Shift Jacket is the warmest in Patagonia's Snow line, with 2-layer GORE-TEX fabric, strategically placed Thermogreen® insulation, and a baffled, supersoft interior for wicking, waterproof warmth in even the coldest conditions. Fabric, membrane and durable water repellent (DWR) finish are made without perfluorinated chemicals (PFCs/PFAS).