OK…….this literally the only one in the world like this!! This XUMU is already an incredibly rare one, but it has now had 900 Fill Goose Down added to make it incredibly puffy. All of the existing insulation was removed from the jacket, mixed with the 900 Fill down, and then reinserted. All of this is painstakingly done by hand to insure that the jacket has the perfect amount in each compartment. If you are a puffer enthusiast , this jacket is a must have for your collection . It is truly incredible. Like all XUMUs, it is a one size jacket.