I use moisture wicking sock liners under heavy wool socks.  0% cotton.  I did read somewhere that once cotton gets wet it loses ALL it's insulation value.  Boots are kinda tight though.  I have tried those foot warmers Mike but couldn't fit them under my toes.  Maybe I will try a 1/2 size up boot next time to allow more air room.  
"cayenne pepper" Raven?????  
