I now own 6 pair of Spun Bamboo socks and three SB t-shirts (2 short sleeve, 1 long sleeve) ... and the quality is great to the point of being luxurious.
The t-shirts feel so good I don't want to wear them to the gym and get them smelly and dirty. The SB socks make me want to throw away all my other socks. Wearing some right now while I write this -- they're smoking jackets for the feet.
I love bamboo fabric; I have shirts, towels, even underwear, so socks seemed like a no-brainer and these would have been except the top band is way too tight and by the end of the day, I have deep indentations on my calves. These go up pretty high, so it's an issue.
Love them, so thick and soft. Price is a bit high, to buy a pack.
Overall, very comfortable. They seem to be cooler than my usual socks and my feet don't seem to have any athletic odors after exercise, etc. after using them.