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 750 goose down, with extra down at the foot-end, hood, and heat collar. The main zipper has a down-insulated heat flap and short length, while three sliders and an extra opening on the right side allow you to move freely. The outer bag is filled with synthetic material and has a short centered zipper, with C6 WR treatment on all materials and a water-repellent coating. Both bags have spacious inner pockets for essentials.Both bags come equipped with spacious inner pockets to keep your essentials safe and within reach, so you can stay warm, comfortable, and worry-free.