The North Face Hightail 900 15-Degree Down Sleeping Bag culminates The North Faces quest for the lightest, warmest down, and down-proof sleeping bag technology. Incredibly comfortable, ultralight, and toasty warm, the Hightail is part of The North Faces backpacking Flight Series. The North Face starts with ultralight 15 denier ripstop HelioLite ripstop nylon one of the lightest downproof materials in existence and fills it with 900 fill Eastern European goose downthe lightest, most efficient down on the market. The rippled baffle-construction evenly distributes the Hightails 900-fill down for maximum warmth and prevents the insulation from shifting side to side, creating cold spots. The one-third-length zipper features a draft tube to seal in warm air, as well as a no-snag stiffener in the zipper column. Youll be hard-pressed to find a warmer, lighter, more comfortable 15-degree sleeping bag. The Hightail 900 includes a nylon/mesh storage bag for storing around the house and a stuff sack for backpacking.