Kelty Corona 30-Degree Sleeping Bag (Short) 30 F/-1 C Rectangular Insulation: Kelty Cloudloft; Shell Material: NR210T polyester ripstop; Liner Material: polyester-taffeta Two layer, offset quilt construction Two bags can be zipped together to form a double wide and the double wide can be separated into two individual bags. Bag can be unzipped and opened flat for use as a blanket