The North Face Men's Aconcagua Vest Body: 100% nylon. Insulation: 550 fill goose down Imported Polyester lining Machine Wash Insulated jacket provides reliable warmth on its own or when layered 550 fill goose down and Heatseeker insulation with nylon plain weave fabric Two non-zip, 100 g Heatseeker insulated hand pockets Secure-zip secondary external pocket Elastic binding at cuffs