Different types of cloth are used for different types of clothing based on factors like how the material was made, what fiber it is made from, and its weight. Common natural materials include cotton, flax, wool, ramie, silk, denim, leather, and down. Common synthetic materials are nylon, polyester, and spandex. Nylon was the first synthetic fiber produced in 1935 and was used as a replacement for silk. Polyester fibers are strong and shrink away from flames. Spandex is known for its elasticity and is stronger than rubber.