The vaude serniga 1200 down sleeping bag is made for 4 season extreme activities if you re heading up a mountain in deepest winter this is the sleeping bag for you vaude have used 9010 white goose down as the filling for their serniga 1200 goose down is known throughout the outdoor trade for its incredibly effective insulating properties and its ability to pack down small the classic mummy shape helps to make this sleeping bag even warmer by reducing the air volume while cutting down pack siz