I just got two pairs of the Specialized SL sock. Really nice. I like them better than my favorite Pearl Izumi socks.

Sure, they're not cheap at $13 for one pair, but they're so light and they dry so quick! They're made of 68% Micro Nylon, 10% Nylon, and 22% Lycra Spandex. I got one pair of white and one pair of black.