I've got several pairs of ACORN fleece socks, and they are worth the price - they've lasted me several years.  They are thick fleece, very soft and comfortable.  The fact that the socks are made with seams, rather than as a tube, means that they have a very good fit.  I mostly wear them around the house without shoes, or at night in bed (being female, I always have cold feet, fingers, and nose at night).

My only wish is that ACORN made another version of these socks with little rubber grips - we have hardwood floors and stairs in our house, and with these socks, the combination is very slippery.