The Lowland Serai Ultra 1 is a three-season sleeping bag. This goose down-filled sleeping bag is our lightest and most compact mummy model. An excellent choice if weight and size really matter to you. The Serai Ultra 1 has an inside pocket, drawstring, down collar and wind baffle. Also the sleeping bag is equipped with a pre-formed hood. The Lowland Serai Ultra 1 has a moisture-regulating, windproof and water repellent Shell fabric. Because of all these properties the Lowland Serai Ultra 1 an excellent insulation to a comfort temperature of 0 degrees Celsius. The Serai 1 has a weight of only 795g! This sleeping bag is made in our own workshop in the Netherlands.