Perfect for adventuring into the cold mountain air, The North Face Thunder Jacket features 800-fill goose down insulation wrapped in durable nylon ripstop with a DWR (durable water repellent) finish for added weather resistance. This highly compressible and packable piece is ideal for tossing in your pack during backcountry overnighters, just in case your other layers aren't quite keeping the frost gremlins at bay.