Microfiber, as a general term, means that the threads have a diameter of less than 10 micrometers (one denier). If the threads meet that count, they can be called microfiber. Notably, this means that organic threads can’t be microfiber - even the finest silk threads aren’t that small. So microfiber materials are made from synthetic, often plastic-based materials, like polyester and other polymers. This makes them strong and smooth. Within this limitation, microfiber can be a mixture of many different materials and weaving techniques.