Western Mountaineering designed its TerraLite Sleeping Bag for comfortable sleeping whether you're camping or ultralight backpacking. Weighing in at only one pound and thirteen ounces, the TerraLite owes its lightweight quality to the 850 fill premium goose down insulation that can keep you warm in the chilliest summer nights. The continuous baffle construction ensure the down doesn't isolate to one side, and the bag's comfort mummy shape includes a wider mid section that allows you to sleep on your side comfortably. Western Mountaineering built the shell out of a sleek nylon ripstop for durability, and the taffeta lining remains plusher and softer against your skin. The TerraLite also features an insulated hood with an adjustable drawcord, a dual zipper design that either turns the bag into a wide comforter or attaches to other Western Mountaineering mummy bags, and an included stuff sack for your convenience.