My first rule is stay away from cotton. Cabela's ecwcs work pretty well. I try to do a few thin layers instead one or two thick ones. Maybe this year I'll spend the money on a good Merino wool set, but my system is pretty good but I still get cold feet if it's below freezing on long sits. Tried everything in every combination I can think of and read but eventually the dang cold is gonna set into my toes.