The scourge of children of the 80's who grew up where it snows. These were large buckets of plastic, filled with foam that you stuffed your feet into before going to make snowmen. They had a hearty tread on them, that quickly wore through, making them leak cold water and slush in a form not unlike a defective waffle. Then, the foam would soak up all the water, making each calf-high boot mass about a quarter ton.
After about two weeks, when they had dried out and began smelling funny, your mom would get the great idea to use bread bags or newspaper bags to seal them up a little.
The bag kludge didn't last very long.
I suppose they were similar to the boots that the Apollo astronauts wore on the moon. Somehow, I doubt theirs leaked.