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Remarkably light and compact, the Marmot Helium 15 Sleeping Bag delivers impressive insulation. Use it as a three-plus season bag to substantially reduce your load while backpacking and mountaineering. The Helium features certified 850 Fill Goose Down the best weight to warmth down in the market; 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.