One of the latest additions to Western Mountaineering's Extremelite Series is this wide sleeping bag made for side sleeping comfort. It features a 12 denier ripstop nylon shell fabric with a 15 denier nylon taffeta lining material. There are two zippers allowing this bag to mate with other #5 zipper mummy bags and the second zipper opens the bag up completely around the foot. With both zippers open this bag can make a fairly wide “camper van” comforter, but even when zipped up it is extremely comfortable. This is due to its wide girth through the middle of the bag, a design that side sleepers will find ideal. Despite the comfortable shape, this bag weighs less than two pounds.

The 6' size weighs 1 lb. 13 oz.

The 6' 6" size weighs 1 lb. 15 oz.

Western Mountaineering rates the TerraLite at 25°F, which is based on extensive field testing. The EN13537 "Comfort Rating" (a.k.a. "women's" or "cold sleeper") is 28°F, and the "Limit Rating" (a.k.a. "men's" or "warm sleeper") is 18°F.