The hackle (that goes for all 3 colors) is nothing more than Chinese Rooster Hackle for Hareline Dubbing. The Whiting American Hackle that became available last year has more feathers/cape that are of the same quality and size.
The secret to making hackle look like this is to tie it in by the tip and wind at least 5 turns at each hackle location. The fly pictured has 7 wraps of hackle at each location. By tying it in by the tip, it is easy to double the hackle as you wind it; thus, the hackle flows backward over the fly.