Patagonia Lightweight Black Puffer Down Sweater Vest Size: M Material:Down, Polyester The perfect warmth for just about everything, the classic Down Sweater Vest is lightweight and windproof with a 100% recycled polyester ripstop shell and 800-fill-power Traceable Down (800-fill-power goose down from geese traced from parent farm to apparel factory to help ensure the birds that supply it are not force-fed or live-plucked, as certified by NSF, an independent third party).