The best composite i have seen thus far is a window called Starmark that is made by okna windows. I have yet to see another composite window that looks nicer or is more air tight.

The THV uses a cellular composite material and while I am a fan, there are more proven executions of that material.

Starmark is one that comes to mind and is a well vetted and reviewed product.

What window was he offering as the "Fiber" frame?

Thanks WoW.

I'll have to see if Starmark is available in Atlanta.

The Fiber frame are Comfort Line by Fiberframe:

http://www.fiberframe.com/Home.aspx