Remarkably light and compact, the Helium delivers impressive insulation. Use it as a three-plus season bag to substantially reduce your load while backpacking and mountaineering. Independently tested and certified by international down and Feather Laboratory in Salt Lake City, Utah. Retested at fill time in Santa Rosa to ensure 850+ fill power every time. If the down does not meet Marmot's In-House Test, they send it back. Passive collar. Velcro-free Face Muff - keeps the draw cord and zipper away from your face. Full length zipper. Zipper guards - helps repel biting zipper coils. Zipper garage. Main Material: 20 denier 100% nylon mini ripstop DWR 1.1 oz/yd. Lining material: 20 denier 100% recycled polyester mini ripstop DWR 1.0 oz/yd. Insulation material: 850+ fill power goose down.