Stretchy materials are fabrics that are able to stretch and return to their original shape. Spandex, ELASTIC, and Lycra are all examples of stretchy materials. Spandex is a synthetic fiber known for its exceptional elasticity, while ELASTIC is a material made from rubber or a rubber-like synthetic material. Lycra is a brand name for a type of spandex fiber. All three materials are commonly used in clothing and other items that require flexibility and a snug fit.