I have smartwool socks as well but like rgmn said you don't want your shoes to be too tight with them. If you want to go cheap you can try chemical toe warmers and taping over the vents in your current shoes. The real solution is winter biking shoes, the think wool socks, and if it is really cold also the chemical toe warmers. I have bad circulation in my feet and they freeze in the winter so years ago I broke down and spent the money on some lake cx145 and those were a huge improvement.