at first glance these looked a lot like other gray moisture wicking socks i have. but upon wearing them for a bit, it's obvious how much warmer they are

mine came labeled as follows:

60% merino wool
18% cotton
15% polyester
7% elastic

EDIT (3/23/2011) : after 1 winter's use 3 of the 6 socks have developed holes. would not buy again