The North Face Women's ThermoBall Full Zip Jacket is an insulated jacket for staying warm in cold, wet weather. PrimaLoft® ThermoBall™ is a synthetic insulation, built to mimic the weight, warmth, and compressibility of down, while providing better performance when the weather gets wet. The tough nylon exterior helps ensure the light weight and the whole jacket packs down into it's own pocket. Throw it in your backpack, whether you're out on a hiking adventure or even unsure about the weather you'll run into after work. The close-fitting active fit encourages movement and lets you enjoy the cold.