Crawl in, wrap up, stay warm. This innovative design has proved to be a favorite for cool summer nights in camp, replacing a restrictive mummy-style bag. The absence of zippers and the self-packing design makes it a lightweight alternative to a traditional summerweight bag. Rated to 40°F.Eddie Bauer First Ascent is a comprehensive collection of premium, technical outdoor products for all mountain experiences, informed by over 100 years of product development and design expertise.