Are you asking about dynamic hair or regular hair meshes?

I have gotten some wonderful dynamic hair by Adorana.  I'm pretty sure it was from the Poser free stuff here.  She also has a set of shaders for dynamic hair, and free skull caps for various figures.

You could see how they work out for you and, if you like the results, you could see how the nodes are set up.  I just looked, and it seems I didn't install them to this computer yet, so I don't have a link to give you.  Shouldn't be too difficult to locate.  Hope this helps!

John