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The Spark Ultralight Mummy Sleeping Bag Series is designed for every type of adventure—from lightweight liners for summer trips to warm, packable bags that will keep you cozy through chilly winter nights. Crafted with premium materials and a focus on performance, these bags simplify your experience without compromising on quality._Ultralight does not mean cramped; the Spark's snug mummy shape is engineered to retain heat while providing enough space for comfortable movement after a long day on the trail. It is ideal for fast-moving backcountry explorers who aim to carry no more than necessary._850+ FILL Power, RDS-certifiedGoose Down with Ultra Dry Down treatment for enhanced water resistance in damp conditions.10-Denier Nylon shell and lining.10-Denier Nylon waterproof-breathable hood and footbox.Mummy Fit: Fitted cut with a generous footbox and technical hood, maximizing thermal efficiency while minimizing bulk and weight.Spark 7C/45F & 1C/30F Primary zip - 1/2 length #5 with zip-plow and two sliders.Spark -9C/15F & -18C/0F Primary zip - 3/4 length #5 with zip-plow and two sliders.Vertical chest baffles, horizontal baffles, lower half, and base.SPARK 7C features sewn-through quilted construction throughout.SPARK -1C/30F includes box wall baffles in the top half and sewn-through quilted construction in the lower half.SPARK -9C & -18C employs box wall baffle construction throughout.Spark 7C, -1C & -9C has a standard front draft collar.SPARK -18C includes double draft collars.Spark 7 & -1 cannot be paired.Spark -9 & -18: Pairs with Women's Sea to Summit bags.QuiltLock System integrates with StS quilts.Best Use: Ultralight Backpacking.Comes With: Ultra-Sil compression bag and storage cell.Insulation: Ultra-Dry Goose Down 850+ Loft.Material(s): 10-Denier Nylon shell and lining, 10