Rokk Icefall 48-Ounce Mummy Sleeping Bag (Blue/Grey) Shell;: 100% Polyester Liner Fabric: 100% Polyester Insulation Type: 100% Polyester Fiber Imported Oversized mummy sleeping bag with expandable fleece center for more room and ventilation control Bag measures 33 by 86 inches (W x L) Three pounds of 100 percent recycled EnviroTemp Fiberfill insulation Durable ripstop polyester exterior polyester liner; offset quilt construction Rated for 15 to 30 degrees Fahrenheit