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Microfibre (microfiber in American English) is synthetic fibre finer than one denier or decitex/thread, having a diameter of less than ten micrometers.
The most common types of microfiber are made variously of polyesters; polyamides (e.g., nylon, Kevlar, Nomex); and combinations of polyester, polyamide, and polypropylene. Microfiber is used to make mats, knits, and weaves, for apparel, upholstery, industrial filters, and cleaning products. The shape, size, and combinations of synthetic fibers are chosen for specific characteristics, including softness, toughness, absorption, water repellence, electrostatics, and filtering ability.
They are commonly used for cleaning scratch prone surfaces such as displays, glass, and lenses. Microfiber cloth makes use of van der Waals force to remove dirt without scratches.