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. Although these are certified by EU at 0 degrees Fahrenheit, we have, personally, tested these bags to -7 and can report we were toasty and comfortable. 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 over 4 pounds. A high quality compression is included and measures 16 x 8.