Microfiber is synthetic fiber finer than one or 1.3 denier or decitex/thread. This is 1/100th the diameter of a human hair and 1/20th the diameter of a strand of silk. The most common types of microfibers are made from polyesters, polyamides (e.g., nylon, Kevlar, Nomex, trogamide), or a conjugation of polyester, polyamide, and polypropylene (Prolen). The shape, size, and combinations of synthetic fibers are selected for specific characteristics, including softness, firmness and resilience.
Microfiber are generally quite wrinkle resistant and easy to care for. They are also much lighter than cotton, breathe just like cotton, dry quickly and last for many washes. They provide a luxurious feel and softness and being a synthetic are better for those with allergies.