These boots are great!! We just had a blizzard in CT and they kept my feet dry, but not so warm. They are a plastic foam-like material that the whole boot is made of. Very lightweight which is great. The only think that kept me from giving a 5 star is the pull-draw string. I had to adjust the tightness on the string multiple times as they did not stay taught. I was moving with the snowblower and shoveling like mad so I probably over-worked them! lol Buy these!! :)