Polypropylene fiber has many positive characteristics that dictate its wide range of applications. The material is strong, quick drying, colorfast, stain resistant, thermally bondable, and hardy against chemicals, perspiration, mildew, and weather conditions. Moreover, polypropylene fiber has the lowest specific gravity of all synthetic fibers, which makes it lightweight and enables it to float in water. Due to such qualities, the material is used in an array of items, including baby diapers, hygiene products, sportswear, carpeting, upholstery, ropes, and automotive interior fabrics. Also, recently polypropylene fiber has become a common additive in concrete, believed to be an effective method of controlling shrinkage cracking.