I wish wool socks solved my problems.................. anything lower than 20F and my feet are cold. Till that point I wear wool socks and non-insulated hiking boots. Lower than that it is wool and light weight, 200 - 400 gram thinsulate hunting boots and I hope I get to work before the feet freeze. My feet sweat in sandals at 40F and they still get cold. I guess I am just cursed with weird feet. I think I will be trying a pair of moisture barrier socks this winter when it gets down to the single digits.