The Big Agnes Lost Ranger 15 Sleeping Bag blends backpacker friendly weight with bad weather camping protection. DownTek treats the lofty down insulation with water resistant protection to retain its loft and warmth in rainy weather and moisture riddled environments. Insotect Flow Construction optimizes insulation by strategically placing vertical chambers with Flow Gates to minimize shifting and to ensure warmth where you need it most. Big Agnes also equipped the Lost Ranger with a water resistant shell and a downproof lining for extra protection and comfort. The lining has loops to attach separate liners, and draft tubes cover the hood, collar, and full length zipper to keep brisk breezes at bay. For a roomy rectangular shaped bag, the Lost Ranger is surprisingly light and compressible to take backpacking. Since Big Agnes doesn't insulate the bottom of bags, be sure to pair this sleeping bag with a 20in sleeping pad.