Flat diapers are a type of cloth diaper made from a single layer of fabric, typically cotton or a cotton blend. They are square-shaped and can be folded in various ways to fit a baby. Flat diapers are versatile, easy to clean, and quick to dry, making them a popular choice for many parents. To use flat diapers, parents fold the fabric and secure it with a diaper pin or a snappi. They often require a waterproof cover, such as a PUL cover, to prevent leaks. Flat diapers are economical and environmentally friendly, as they can be reused and washed multiple times.