The Snugpak Expansion 2 is an ideal outdoor adventure companion for Spring-Autumn use. The 3 season bag has a clever built in expansion panel in the zipper that allows the bag to increase in width for more comfort while warmth is maintained. The Softie® Insulation which was developed exclusively by Snugpak makes use of super fine synthetic yarns bound with special resins which creates a true down like feel for the user. The staple yarns minic the compositions of natural insulation. Product Code: EACEV8TI0126 Snugpak Softie Expansion 2 Sleeping Bag | Sleeping Bags UK