Kelty Callisto 0 Degree Sleeping Bag Regular Fill: Polyester Fiber; Shell: 100% Polyester; Liner: 100% Polyester Imported Temp Rating : 0 / -18C Insulation : CloudLoft Synthetic Weight 5 lb. 4 oz. Can be fully unzipped and opened flat for use as a blanket Differential cut to maximize loft and warmth