Dickies Men's Thermal Socks, 2 Pack
I do astrophotography in Colorado , and the nights in winter reach below zero. I used to wear a double pair of socks with heavy boots, but it barely made a difference. On trying these the first night out, the difference was fairly astounding. The temperature was 2 degrees and it took about 6 hours before I started to feel a discomfort of cold, but it was manageable. Now I just wear them around the house like other socks in winter. The socks are very soft and fit just fine (I'm size 13). Another note is that they dry pretty fast compared to my other thermal socks, they don't really retain moisture in the cold.
Dickies Men's Thermal Socks, 2 Pack: