Tipping the scales at just over a pound, the Phantom 45 is the lightest bag in our line. A great summer bag for lower elevations and warmer climates, the Phantom 45 has a snug mummy fit built from Superlight 15 denier fabric. Insulated with 800-fill down. The down-filled face gasket comfortably blocks drafts at the hood opening and the six-chamber hood design maintains even loft around head for consistent warmth. The Comfort footbox follows natural foot position for maximum warmth and comfort.