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.
 

A Regular sized bag, it measures 34 inches at the shoulders and 86 inches in length.  This is ideal for most adults.  Weighing 5 pounds, 14 ounces, this bag offers outstanding capabilities at a very low weight.