The Mountain Hardwear HyperLamina Spark Sleeping Bag is a 35 degree sleeping bag for hiking and climbing. Stuffed with Thermal.Q™, the synthetic insulation has been zoned to maximize warmth right where you need it most. Your core and feet will revel in the coziness through the night, helped along by a hood and face gasket that blocks drafts. The center, half length zip helps to drop weight without denying the right to open it up and cool off around 2am. The finished weight of 1lb, 12oz and stuff size of 6"x13" makes carrying it around in your pack simple for whatever adventure you've got planned next.