Mountain equipment glacier expedition sleeping bag left zip an ideal bag for polar expeditions incredibly warm and one of only a handful of bags to make use of our roomier expedition fit it is well suited to extended time on the ice features drilite loft tm ii outer shell is lightweight breathable and water resistant 1352g of 90 10 pure duck down with a minimum fill power of 700 expedition fit is roomier for additional clothing trapezoid baffles and slanted box wall baffles mid l