Here's what other sites are saying:
Offering max warmth in a minimal package for extended trail time, the women's Eureka Spero 20 sleeping bag has a trim mummy shape and shingle-style construction that balances comfort and performance.
Designed with a trim, performance shape and shingle style construction, the Eureka Women's Spero 20 Sleeping Bag: 22 Degree Synthetic travels far and packs light without sacrificing a comfy night's sleep. The 40D polyester taffeta shell fabric offers durable protection against the wear and tear of the trail, while the Eureka! Synthesis synthetic insulation delivers cozy sleeping situations in temps as low as 22-degrees Fahrenheit. A full-length, insulated zipper draft tube with anti-snag guard prevents unwanted cold air from sneaking in, while the peached polyester lining has a warm-to-touch feel. The anatomic hood ensures that no space is wasted and is insulated along with the chin baffle to stop precious warmth from escaping. When morning time rolls around and it's time to pack up, the stuff sack compresses for a super easy carry down the trail.
Eureka Backpacking Sleeping Bags Spero 20 Sleeping Bag (synthetic) - Women's-Yellow-Regular-Left.