Hide: The skin of an animal, either raw or treated used for making clothing and footwear.
Leather: An animal skin made smooth and flexible by removing the hair and then tanning.
Plastic: A material made from petroleum. It can be molded and formed into various shapes. There are many different kinds of plastic made from different combinations of chemical compounds.
Rubber: An elastic polymer which occurs in nature as a milky emulsion (also known as latex) in the sap of a number of plants, particularly in South America. It can also be produced synthetically.
Silk: A fabric made from the fine threads produced by the silkworm.
Sole: The word can refer to both the underside of the foot, and the underside of a shoe.