I totally love these socks. They really made winter more bearable for me, as my feet are usually SOOOO COLD all winter long. These really helped keep my feet warmer. I think they are an excellent value, too. As to care, I fold them into pairs in my laundry hamper to make them stand out from my other laundry, and once a week I hand wash them all in Woolite and hang to dry over a towel bar. They wash very nicely this way - not sure I'd wash them by machine.
My only caveat is, I think they run pretty small. I wear a women's size 9 shoe, and these are very close fitting on me, and actually a little tight around the ankles. I can't imagine them fitting most men...