Fast fashion is the term used to describe clothing that is produced quickly and cheaply. Brands and retailers that engage in fast fashion often create products based on seasonal trends directly inspired by the runway. Fast fashion brands are generally associated with overproduction, low retail prices, mass waste, poor working conditions, and negative environmental impact. The fast fashion business model was made possible during the late 20th century as manufacturing of cloth became cheaper and easier, through new materials like polyester and nylon, efficient supply chains and quick response manufacturing methods, and inexpensive labour in sweatshop production (e.g. in Los Angeles) and low-labour protection bulk clothing manufacturing industries in South, South East, and East Asia.