Outsoles can be made from SBR (sulfur butadiene rubber), traditional gum rubber, and various other materials.
UPPER: The upper is the top part of a shoe that is adhered to the foxing and outsole, it can be made from a variety of materials.
When designing an upper, many things are considered: flexibility, weight, durability, breathability, and fit. Footwear uppers range from the very simple to the very complex.