Outbound Toaster 4000 Sleeping Bag, Medium, Navy Heavy duty cotton duck shell material with an insulated zipper guard/draft tube Premium quality authentic cotton flannel lining (not a printed polycotton) 4.5 lbs of our Quadratherm synthetic insulation; This amount of fill ensures an accurate temperature rating to -4 degrees Fahrenheit Dimensions: 80" X 40" Comes with a 600D Polyester carry duffle