Stuffed to the maximum with Eureka® Synthesis Performance Insulation – Eureka's lightest weight, most compressible insulation yet – the Spero 20°F Sleeping Bag not only keeps you warm when the temperature drops, it also packs down to a super-small size to easily travel with you anywhere. Synthetic fiber blend insulation delivers long-lasting heat-retention to ensure you sleep comfortably in conditions down to 20°, while the peached polyester lining and full-length insulated zipper draft tube prevent warmth from being robbed by wind sneaking in during the night. Insulated hood and chin baffles provide added warmth retention. Locking two-way zipper allows you to make adjustments for improved air cirulation and cooling ventilation. Internal pocket keeps valuables within easy reach. Included compression stuff sack. 40-denier, 290-threadcount polyester taffeta shell and 50-denier, 300-threadcount peached polyester lining. Imported.