Smart Wool socks are long-lasting and comfortable.  They keep your feet warm when it's cold, cool when it's warm, and dry at all times.  They also last much longer than most other types of socks.

The different styles of socks tend to run a bit odd on sizes.  My first pair of Saturnsphere socks were mediums, as recommended (size 9 shoes).  The heel tends to move under my foot, with the result that the sock wears out a little faster than it should.  With my last pair, I ordered the large.  Problem solved!  The socks stay put, with the thicker heel area actually on the heel.