Why are they called “Synthesis”?
The answer is one Chris' website in the description of his Synthesis series;
"My Synthesis Series of rods is complex yet uncomplicated. These blanks are made domestically here in the US for me, to my exact specifications. A technologically advanced fusion of parabolic and progressive fly rod tapers, blending my two previous series of rods without watering down the effectiveness and feel. Making use of advanced compound tapers, seamless and functional tip over butt ferrules and traditional e-glass. Not necessarily progressive or parabolic, the best of all synthesized into a new classic.
Smooth and unhurried with quick recovery. Responsive tip, mid and butt sections. You feel the cast and the fish."
I'm fortunate enough to have 2 of his older rods in a "progressive" taper and 2 of the Synthesis series...weapons on the water, I call my General Pacticioner (7'9"-4 wt) the Jack Russell Terrier of fly rods, them terriers act bigger than they are and that rod fishes bigger (water, distance, & fish) than it is.