Also called Polyurethane, it's not a natural material but a synthetic.
It's used as both a material for soles, and also as an upper. It
can be painted upon easily, it's strong, durable and light weight.
Urethane is most commonly used for Wellington boots. Some other
popular materials used for making shoes are canvas and leather.
Canvas is ideal as a material for uppers, it's light weight and
durable and used for sports shoes. Cloth based uppers are also common
in warmer climes of the world where the foot needs to breath more
freely. Leather is the most common material used for uppers in colder
climes of the world. It's also used as a sole, but this isn't as
common because leather is not water proof. Leather uppers vary greatly
in looks and durability. This is because the different hides from
animals vary in their properties.