Well, I have been very happy with the Teko socks. I wear the really light and low cut ones for the gym and when I was running outside. I bought a couple of pairs of slightly heavier ones, to wear running in the cold weather, but I found they weren't really warm enough for the real cold and I ended up wearing my x country ski socks, that are thin, but high up. They did work for the fall, though. My feet are extremely sensitive to even a hint of thickness in socks; they feel like they are being squeezed. I can't really wear any cycling socks except super thin wool ones, now.