The Green Valley sleeping bag by Coleman keeps you warm even when the temperature drops down to 40 degrees. It features a Coletherm insulation that gives you the warmth you need while you are on camping or hiking at any time of the year. The fabric of the Coleman Green Valley 40 Degree Sleeping Bag is made of polyester and lined with cotton flannel to help insulate and regulate heat. Its size, 80cm wide and 190cm long, provides extra comfort while you are sleeping. The insulated sleeping bag can be folded and tied along with your backpack when not in use.