A seriously light, warm, and compressible sleeping bag Western Mountaineering designed the Highlite to be ultra lightweight and compact, but they did so without taking any shortcuts. 8 oz of premium 850 fill down lofts the Highlite to a full 3.5 inches. Horizontal baffles are sewn through similar to other western bags while vertical seams are baffled with 1.5 inch netting to keep insulation in its place for unimpeded loft. Aiding the down insulation is a trim and efficient cut that allows the bag to warm quickly, and remain comfortable down to 35 degrees. The Western Mountaineering Summerlite weighs in at just 16 ounces. Much of the weight saving can be attributed to the ultralite 12 denier ripstop nylon shell fabric that is durable for the incredibly light weight less than an ounce per square yard. A half length 4 YKK zipper adds to the weight saving without compromising ease of use. The WM Highlight offers an incredible balance of warmth, weight, comfort, and build quality. Features and Benefits a Ultralight 12 denier ripstop nylon shell fabric. a Sewn Thru and baffled box construction. a 5938 shoulderfoot girth. a 35Adeg F rating a 8 oz. Down Fill. a Just 16 ounces total weight.