What is a flat mop?

A flat mop is often made of cotton or microfiber which is intended for cleaning floors. Microfiber flat mops have been on the market since the 1990s. Cotton fiber has a thicker fiber and thus greater absorbency. This allows working with a lot of liquid. Big disadvantage is that it absorbs a lot of dirt and liquid which one smears afterwards. Also in terms of ergonomics, the cotton version is less efficient because it becomes heavier due to its high absorbency.