My feet typically get cold in October and don't thaw out until April.  I read the reviews on these socks and took a chance.  I got them, washed them and put them on.  After wearing them for a full day, when the low was 22, and being outside quite a bit, my feet stayed warm, whether I was wearing boots, slippers, or just the socks. They feel wonderful on my feet, aside from keeping them warm, they are cushiony and soft.  I just ordered 3 more pairs. I've never spent this much for socks before but it's heavenly not having ice-cubes for feet.