Primarily because Maxima has a Leader Kit (
http://www.maxima-lines.com/leader.htm), which is what I started with.
Maxima is Mono, but it is specially formulated to have similar "invisibility" properties as flouro. For the very butt section of leader material, I use Maxima Chameleon, and for the rest I use UltraGreen.
Why, you ask? Because that is the formula suggested by Gary Borger in one of his books I read. His argument in favor of this impressed me at the time, but now I have completely forgotten what it was!
In any case, the leaders are excellent and roll over very nicely. You can use whatever tippet material you like, and I do use Frog Hair. I love the stuff.
The properties of both UltraGreen and Chameleon are described here:
http://www...-lines.com/lineFrame.htm
My .02, for what it's worth!
Buzz