One of thelatest additions to Western Mountaineering'sExtremelite Series is thiswide sleeping bag made for side sleeping comfort. It features a12 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 zippermummy 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 TerraLiteat 25F, which is based on extensive field testing. The EN13537 "Comfort Rating" (a.k.a. "women's" or "cold sleeper") is 28F, and the "Limit Rating" (a.k.a. "men's" or "warm sleeper") is 18F.