Twin-bag sleeping bag for polar expeditions and overnight trips during the deep winter in Norway (ors Sweden and/or Finland for that matter). Spitsbergen is a result of collaboration with polar expedition ambassadors and countless experiences in inhospitable areas. These two sleeping bags offer the warmth and comfort of goose down and the thermal efficiency of synthetic filling. The inner bag has been updated with 900+ goose down. The innerbag has arm openings and the hood part has connectors to connect the inner bag with the outer bag. The outer bag is filled with synthetic material and has a center Vislon zip that is easy to find and use and will not freeze. The outer fabrics have been updated to withstand more humidity and have a 1000mm water column.