The robust Slumberjack Timberjack series of sleeping bags are feature rich, and are designed for maximum comfort and warmth. For summer excursions, the Slumberjack 40 Degree TimberJack Rectangular is a great choice. With a soft touch lining and pillow pocket, you're assured a cozy night's sleep, and the amazing value will assure you pleasant dreams. Slumberloft synthetic insulation. Polyester ripstop shell, soft touch polyester lining. Two layer offset quilt construction and differential cut prevents cold spots. Anti snag zipper protection. Draft tube along zipper keeps out cold air and prevents heat loss. Integrated pillow pocket, stuffs into its own storage pocket when not in use. Zip together feature allows two same size rectangular bags to be joined, making a double wide bag for two. Stuff sack included. Regular right zip only.