These are a very special design of water-proof sleeping bags. These are made with a new-age material which stops moisture, including rain, from entering the interior sleeping compartment but allows perspiration to transfer from the interior to the outside. These are certified by EU at -20 degrees Fahrenheit. These bags are, also, 100% wind proof by design. Large baffles are along the entire zipper a neck guard a chest guard. The Extra Large, Extra Long is specifically designed for adults weighing more than 200 pounds. This special design provides an extra 4 inches of width at the shoulders AND an extra 4 inches in the foot box. This should permit the camper to easily roll over without being twisted up in the sleeping bag. Weight is just under 6 pounds. A high quality compression is included and measures 18" x 12".