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Microfiber or Microfibre is fiber with strands less than one denier. Fabrics made with microfibers are exceptionally soft and hold their shape well. They are also used for some cleaning applications, because of their exceptional ability to absorb oils.
http://en.wikipedia.org/wiki/Microfibre
FUNCTIONAL USE
Microfiber performance apparel has become a very popular alternative to cotton apparel for athletic wear, such as a cycling jersey, because the microfiber material wicks moisture away from the body, keeping the athlete cool and dry.
Microfiber is also widely used by car detailers to handle such tasks as removing wax, quick detailing, cleaning interior, cleaning glass, as well as drying. Due to its fine fibers which leave no lint or dust, microfiber is a popular choice of towel for avid car detailers and enthusiasts. Chamois leather is also used.
Microfiber textiles tend to be flammable and emit toxic gases when burning. Microfibers are made with synthetic fibers such as polyester and nylon, which are made from petrochemicals. Microfibers are not made from a renewable resource and they are not biodegradable.