The Coleman Heaton Peak 40 Degree Rectangular Regular Sleeping Bag is for use in cooler weather. The rectangular shape gives you more square feet for more leg room. For 40 degree temperatures, the cover is made from polyester, and the liner from cotton flannel. The insulation is just right for cooler weather at 48 ounces Coletherm fill. Measures 39×81 inches. The Ziplow no snag zipper, and roll control system are great for quick and easy rolling, and folding. Quick cord system provides simple and secure no tie storage, and the integrated pillow sleeve connects to the cuff to prevent your pillow from getting away from you at night.