I have some PI's with a thick, grey chamois, and I can't stand them. They bunch up horribly in the girly bits. I love my Shebeest Triple S shorts with the SheLastic Chamois. It's got a microfiber layer over the padding and I slide around on it much more. Much better. I'm hoping for a pair of the new Elite Distance 2 shorts for my b-day... that chamois is nice, too.

And Chamois Butt'r or Assos chamois cream (my fave) helps with the friction.