I got a couple pairs of the knee high bamboo charcoal socks.
Some notes:
1) As reckless toboggan pointed out, these are adequate for the job of preventing shinners while XC or trail riding. I wore them yesterday on local flow trails with less serious airs and not much super-chunk/tech stuff.
2) They are like 3/4" shy of my knee-pad bottom. I wish they were just a tad longer, for no reason other than silly weird tan lines ;) I don't actually expect a shinner that starts on the sock to slide up into that little gap anyways.
3) When I first put them on, the D30 pads were not super comfortable (stiff weird pads in front of ankle bones, just felt not super comfy), but once warmed up a bit from riding they "disappeared" and I didn't notice them anymore.
4) I didn't do too much pedaling yesterday as it was a shuttle day, but it was plenty hot (90 in the sun, high 70's under the forest canopy) and they wicked sweat very well. At no point, while I was sweating and gasping for breath, did I think to myself "these socks are too hot." My goggles were soaked and my helmet doesn't have enough vents, and I only wear full-fingered gloves regardless of what I'm riding (which were warmer than I wanted yesterday), but the socks were totally fine.