DESC: Sleeping Bag - Find the Sleeping Bag at AJ Prindle. Keep warm and sleep comfortably in the back of your truck or SUV with this massive sleeping bag. The durable outer shell is constructed of 100% polyester fabric and the soft, 100% cotton flannel lining helps keep you toasty warm down to 0-deg. F. Buy two and zip them together for double mattress coverage. Two-way zipper. Made in USA with DuPont Polyester Hollofil 909 insulation. Machine wash. Not for use while vehicle is moving.