Emu boots are the warmest boots I have ever owned and I live in Minnesota where winters can get pretty cold.  I love these boots.  I originally bought a brown pair in size 7 and I do admit they run a little big so when I saw the black one's I just had to purchase a pair so I got those in a size 6 and they fit much better.  My feet do not get cold in these boots when I am outside.  I can go for walks on the coldest of days and my feet will not get cold at all.  I also bought a pair of house shoes that were Emu's and they are awesome as well.  They fit well, they are comfortable and I just love how toasty they keep my feet.  I highly recommend Emu boots!!  They are high quality and made very well.