The Western Mountaineering Summerlite was introduced more than a decade ago. At that time, it set the bar for down bags that could keep you comfortable at freezing temperatures. It still remains well-known for being one of the most conservatively rated down mummy-style sleeping bags on the market. Exceptional quality of construction (materials, stitching, cut-and-sew, consistency) that’s backed by a company that still commits to the customer service of its users.