In reply to Bobbirks95:
Super thick Thorlo ones on the inside, and something slightly less thick over the top of those. After two days (maybe one) the inside socks become the outside socks and a fresh pair of big thick ones go inside.
Thicker than most people wear, but it works for me. Nice and toasty too. No cold feet for me, or bruised toes, or blisters.
The smartwool ones (flecks of red) aren't nearly as good as the Thorlo (cream with grey).
I have volume reducers under the insole too.