Jannu Jacket BLACK JUICY NEPTUNE The Jannu jacket has been developed to fill the gap between the Batura Jacket and the Summit and Neutrino Endurance jackets and is designed for trekking to or extended stays at Altitude in areas such as teh Himalaya or Andes or for lightweight Polar exploration or for Alpine style use in the very worst conditions. The Jannu takes the narrow box wall construction of the Batura and then is filled with 400g (size large) of high quality 750 fill power European goose