Hey, i have some coolmax ski socks, and also some knee high wool socks, there the best, they arnt very thick when worn together, but nothing gets past them. Also, when its really bad, i sometimes wear gators, there to keep out the snow from getting in your shoe, i dont know if you have that problem or not, but they mayhelp keep the cold out. Check out a local REI or somthing. Keep on ridin'