I may be off base (certainly not the first time) and I dislike the idea of quibbling with the likes of Old Salt, Mad Mat and Solotripper (especially since I very well may not know what I'm talking about)...... now how's that for a disclaimer!  :D

I took a casual peek via photo at the coolmax socks. They honestly don't strike me as a true liner sock. They don't seem thin enough. The idea with a liner of course being a thin very "grippy" type of sock that just plain won't move about. I would have to see what the backpacking community had to say. Probably going to stay with my polypro, they have served me well.