The boots are made from a kind of synthetic material. They are foldable and I think they will be good for the rainy season. They don’t work out for the Candian winter and snow because of the cold. They don’t have insulation against the cold.
As for the sizing, I should have taken a size bigger than my normal shoe size since this is worn over the shoes. I have also tried it with various shoes and they feel most comfortable with flat shoes.