warm feet start with good socks, and from there layers of good insulation and a proper fitting boot
too tight, due to wrong size boot or too many layers or sock thickness, will actually make your feet colder and NOT warmer
if your a person that there feet sweat easy, you need to work with better socks and breathing boots
I used more light weight boots and better socks(smart will are at top of my list in socks), with or without a liner, pending temps!
and I use good higher end 400-800 gram leather gore tex lined boots that fit well with the socks I plan to wear!
yrs of trying tons of heavy big bulky boots and thousands in dollars, have shown, me, I don't need them things and there just heavier and at time NOT any warmer
like all gear today, better stuff works better without all the bulk as in the past!
and I will say this, NOT everyone's feet are not the same in handling colder temps as others!
what works for me, might NOT work for you, same as in gloves!
circulation and not being too tight are a key in keeping toes warm!